Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"doan van cao snippets" » "doan va cao snippets", "hoang van cao snippets", "luan van cao snippets", "doan van dao snippets", "doan van bao snippets", "doan van cau snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs code snippets", "locating bug core snippets"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("doan van cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("doan van cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( doan van cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("doan van cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.