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main.py

@@ -140,7 +140,7 @@ Quy tắc tuyệt đối:
     # Advanced RAG options
     use_advanced_rag: bool = True
     use_query_expansion: bool = True
-    use_reranking: bool = True
+    use_reranking: bool = False  # Disabled - Cross-Encoder not good for Vietnamese
     use_compression: bool = True
     score_threshold: float = 0.5
 
@@ -779,10 +779,19 @@ Example:
                 )
 
                 # Build messages
-                messages = [
-                    {"role": "system", "content": system_message},
-                    {"role": "user", "content": request.message}
-                ]
+                if request.use_advanced_rag and context_used:
+                    # Advanced RAG prompt already contains query + instructions
+                    # Just send it as system message, user message is empty
+                    messages = [
+                        {"role": "system", "content": "You are a helpful assistant."},
+                        {"role": "user", "content": system_message}
+                    ]
+                else:
+                    # Basic RAG or no RAG - normal message flow
+                    messages = [
+                        {"role": "system", "content": system_message},
+                        {"role": "user", "content": request.message}
+                    ]
 
                 # Generate response
                 response = ""