Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"hieu he do snippets" » "hieu ve do snippets", "hiem he do snippets", "hieu le do snippets", "hieu che do snippets", "hieu he co snippets", "hieu ke 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 he do 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 he do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( hieu he do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("hieu he do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.