Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nam van due snippets" » "nam dan due snippets", "nam va due snippets", "pham van due snippets", "nam van de snippets", "nam van duy snippets", "nam van du 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 van due 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 van due snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nam van due snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nam van due snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.