Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"vun khoa de snippets" » "von khoa de snippets", "van khoa de snippets", "vu khoa de snippets", "vun khoa dr snippets", "vun khoa he snippets", "vun khoi de 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: (((("vun khoa de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("vun khoa de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( vun khoa de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("vun khoa de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.