diff --git a/apps/knowledge/sql/blend_search.sql b/apps/knowledge/sql/blend_search.sql
index 10e0ccbd7a5..2a605c7e51e 100644
--- a/apps/knowledge/sql/blend_search.sql
+++ b/apps/knowledge/sql/blend_search.sql
@@ -14,7 +14,7 @@ FROM
 	(
 	SELECT DISTINCT ON
 		(vc.paragraph_id) vc.paragraph_id,
-		(1 - vc.distance + COALESCE(ts_rank_cd(e.search_vector, websearch_to_tsquery('simple', %s), 32), 0)) AS comprehensive_score
+		(1 - vc.distance + COALESCE(ts_rank_cd(e.search_vector, plainto_tsquery('simple', %s), 32), 0)) AS comprehensive_score
 	FROM
 		vector_top vc
 	JOIN embedding e ON e.id = vc.id
diff --git a/apps/knowledge/sql/keywords_search.sql b/apps/knowledge/sql/keywords_search.sql
index e47bd4e9f44..a445c1478b4 100644
--- a/apps/knowledge/sql/keywords_search.sql
+++ b/apps/knowledge/sql/keywords_search.sql
@@ -7,8 +7,8 @@ FROM
 	SELECT DISTINCT ON
 		("paragraph_id") ( similarity ),* ,similarity AS comprehensive_score
 	FROM
-		( SELECT *,ts_rank_cd(embedding.search_vector,websearch_to_tsquery('simple',%s),32) AS similarity  FROM embedding ${keywords_query}
-		AND COALESCE(search_vector @@ websearch_to_tsquery('simple',%s), false)) TEMP
+		( SELECT *,ts_rank_cd(embedding.search_vector,plainto_tsquery('simple',%s),32) AS similarity  FROM embedding ${keywords_query}
+		AND COALESCE(search_vector @@ plainto_tsquery('simple',%s), false)) TEMP
 	ORDER BY
 		paragraph_id,
 		similarity DESC