Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoi ve do snippets" » "hoi ve do snippets", "khoi de do snippets", "khoi he do snippets", "khoi ve dao snippets", "khoi ve doi snippets", "khoi va 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: (((("khoi ve 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: (((("khoi ve do snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoi ve do snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoi ve do snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.