Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nham van du snippets" » "pham van du snippets", "nha van du snippets", "nam van du snippets", "nham van duy snippets", "nham van dau snippets", "nham van de 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: (((("nham van du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nham van du snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nham van du snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nham van du snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.