Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"nao nghe don snippets" » "nam nghe don snippets", "tao nghe don snippets", "nang nghe don snippets", "nao nghe dan snippets", "nao nghe son snippets", "nao nghe mon 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: (((("nao nghe don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("nao nghe don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( nao nghe don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("nao nghe don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.