Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hieu van vo snippets" » "hieu va vo snippets", "thien van vo snippets", "lieu va vo snippets", "hieu van von snippets", "hieu van vu snippets", "hieu van do 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 van vo 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 van vo snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hieu van vo snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu van vo snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.