Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"lieu van cao snippets" » "lieu va cao snippets", "hieu van cao snippets", "sieu van cao snippets", "lieu van dao snippets", "lieu van bao snippets", "lieu 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: (((("lieu 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: (((("lieu van cao snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( lieu van cao snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("lieu van cao snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.