Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"do duc voi snippets" » "do duc loi snippets", "do dua voi snippets", "do duc vui snippets", "dao duc voi snippets", "do duy 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: (((("do duc 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: (((("do duc voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( do duc voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("do duc voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.