diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/AbstractTermNode.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/AbstractTermNode.php
index 5a1892cce3..0722f31bd5 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/AbstractTermNode.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/AbstractTermNode.php
@@ -25,6 +25,28 @@ abstract class AbstractTermNode extends Node implements TermInterface
         $this->concepts = $concepts;
     }
 
+    protected function buildConceptQueries(QueryContext $context)
+    {
+        $concept_query = $this->buildConceptQuery($context);
+        if ($concept_query === null) {
+            return [];
+        }
+
+        // Extract all should clauses
+        if (
+            isset($concept_query['bool']) &&
+            isset($concept_query['bool']['should']) &&
+            count($concept_query) === 1 /* no options or must(_not) clauses */
+        ) {
+            return isset($concept_query['bool']['should'][0]) ?
+                $concept_query['bool']['should'] :
+                [$concept_query['bool']['should']];
+        }
+
+        // Fallback to returning full query
+        return [$concept_query];
+    }
+
     protected function buildConceptQuery(QueryContext $context)
     {
         $concepts = Concept::pruneNarrowConcepts($this->concepts);
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/TermNode.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/TermNode.php
index 25378811c9..8e0d8be531 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/TermNode.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/TermNode.php
@@ -9,18 +9,13 @@ class TermNode extends AbstractTermNode
 {
     public function buildQuery(QueryContext $context)
     {
-        $query = $this->buildConceptQuery($context);
-
         // Should not match anything if no concept is defined
-        if ($query === null) {
-            $query = [
-                'bool' => [
-                    'should' => []
-                ]
-            ];
-        }
-
-        return $query;
+        // TODO Ensure no match when no concept queries are provided
+        return [
+            'bool' => [
+                'should' => $this->buildConceptQueries($context)
+            ]
+        ];
     }
 
     public function __toString()
diff --git a/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/TextNode.php b/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/TextNode.php
index 0811fb549e..042f313a18 100644
--- a/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/TextNode.php
+++ b/lib/Alchemy/Phrasea/SearchEngine/Elastic/AST/TextNode.php
@@ -68,8 +68,8 @@ class TextNode extends AbstractTermNode implements ContextAbleInterface
             $query = QueryHelper::applyBooleanClause($query, 'should', $private_field_query);
         }
 
-        $concept_query = $this->buildConceptQuery($context);
-        if ($concept_query !== null) {
+        $concept_queries = $this->buildConceptQueries($context);
+        foreach ($concept_queries as $concept_query) {
             $query = QueryHelper::applyBooleanClause($query, 'should', $concept_query);
         }
 
diff --git a/tests/Alchemy/Tests/Phrasea/SearchEngine/AST/TextNodeTest.php b/tests/Alchemy/Tests/Phrasea/SearchEngine/AST/TextNodeTest.php
index 396770ae1c..1514fa8637 100644
--- a/tests/Alchemy/Tests/Phrasea/SearchEngine/AST/TextNodeTest.php
+++ b/tests/Alchemy/Tests/Phrasea/SearchEngine/AST/TextNodeTest.php
@@ -154,4 +154,85 @@ class TextNodeTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEquals(json_decode($expected, true), $query);
     }
+
+    public function testQueryBuildWithPrivateFieldAndConcept()
+    {
+        $public_field = new Field('foo', Mapping::TYPE_STRING, ['private' => false]);
+        $private_field = new Field('bar', Mapping::TYPE_STRING, [
+            'private' => true,
+            'used_by_collections' => [1, 2, 3]
+        ]);
+
+        $query_context = $this->prophesize(QueryContext::class);
+        $query_context
+            ->getUnrestrictedFields()
+            ->willReturn([$public_field]);
+        $query_context
+            ->localizeField($public_field)
+            ->willReturn(['foo.fr', 'foo.en']);
+        $query_context
+            ->getPrivateFields()
+            ->willReturn([$private_field]);
+        $query_context
+            ->localizeField($private_field)
+            ->willReturn(['private_caption.bar.fr', 'private_caption.bar.en']);
+
+        $node = new TextNode('baz');
+        $node->setConcepts([
+            new Concept('/qux'),
+        ]);
+        $query = $node->buildQuery($query_context->reveal());
+
+        $expected = '{
+            "bool": {
+                "should": [{
+                    "multi_match": {
+                        "fields": ["foo.fr", "foo.en"],
+                        "query": "baz",
+                        "operator": "and",
+                        "lenient": true
+                    }
+                }, {
+                    "filtered": {
+                        "filter": {
+                            "terms": {
+                                "base_id": [1, 2, 3]
+                            }
+                        },
+                        "query": {
+                            "multi_match": {
+                                "fields": ["private_caption.bar.fr", "private_caption.bar.en"],
+                                "query": "baz",
+                                "operator": "and",
+                                "lenient": true
+                            }
+                        }
+                    }
+                }, {
+                    "multi_match": {
+                        "fields": [
+                            "concept_path.foo"
+                        ],
+                        "query": "\/qux"
+                    }
+                }, {
+                    "filtered": {
+                        "filter": {
+                            "terms": {
+                                "base_id": [1, 2, 3]
+                            }
+                        },
+                        "query": {
+                            "multi_match": {
+                                "fields": ["concept_path.bar"],
+                                "query": "/qux"
+                            }
+                        }
+                    }
+                }]
+            }
+        }';
+
+        $this->assertEquals(json_decode($expected, true), $query);
+    }
 }