Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hieu do voi snippets" » "hieu so voi snippets", "hieu bo voi snippets", "bieu do voi snippets", "hieu doi voi snippets", "hieu dao voi snippets", "hieu do moi 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: (((("hieu do 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: (((("hieu do voi snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hieu do voi snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu do voi snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.