diff --git a/python/valuecell/adapters/assets/manager.py b/python/valuecell/adapters/assets/manager.py
index 2662556af..77916032d 100644
--- a/python/valuecell/adapters/assets/manager.py
+++ b/python/valuecell/adapters/assets/manager.py
@@ -443,6 +443,9 @@ def _fallback_search_assets(
                 if ":" not in ticker:
                     continue
 
+                if not self.get_adapter_for_ticker(ticker):
+                    continue
+
                 # Try to get asset info
                 try:
                     asset_info = self.get_asset_info(ticker)
diff --git a/python/valuecell/adapters/assets/yfinance_adapter.py b/python/valuecell/adapters/assets/yfinance_adapter.py
index 529e11fd2..735a86006 100644
--- a/python/valuecell/adapters/assets/yfinance_adapter.py
+++ b/python/valuecell/adapters/assets/yfinance_adapter.py
@@ -140,7 +140,7 @@ def _create_search_result_from_quote(
             )
 
             # Validate the ticker format
-            if not self._is_valid_internal_ticker(internal_ticker):
+            if not self.validate_ticker(internal_ticker):
                 logger.debug(
                     f"Invalid ticker format after conversion: {internal_ticker}"
                 )
@@ -170,11 +170,6 @@ def _create_search_result_from_quote(
                 "en-GB": long_name or short_name,
             }
 
-            # Calculate relevance score based on match quality
-            relevance_score = self._calculate_search_relevance(
-                quote, symbol, long_name or short_name
-            )
-
             # Create search result
             search_result = AssetSearchResult(
                 ticker=internal_ticker,
@@ -184,7 +179,6 @@ def _create_search_result_from_quote(
                 country=country,
                 currency=quote.get("currency", "USD"),
                 market_status=MarketStatus.UNKNOWN,
-                relevance_score=relevance_score,
             )
 
             # Save asset metadata to database for future lookups
@@ -234,6 +228,7 @@ def get_asset_info(self, ticker: str) -> Optional[Asset]:
             long_name = info.get("longName", info.get("shortName", ticker))
             names.set_name("en-US", long_name)
 
+            exchange = None
             if info.get("exchange"):
                 exchange = self.exchange_mapping.get(info.get("exchange"))