Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam toan ve snippets" » "nam tan ve snippets", "tam toan ve snippets", "nam thanh ve snippets", "nam toan va snippets", "nam toan ke snippets", "nam toan von 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: (((("nam toan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nam toan ve snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam toan ve snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam toan ve snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.