Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"pham vu voi snippets" » "pham tu voi snippets", "pham va voi snippets", "pham vi voi snippets", "pham su voi snippets", "pham vu hoi snippets", "pham xu voi 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: (((("pham vu voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("pham vu voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( pham vu voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("pham vu voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.