Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"phan khoa de snippets" » "pham khoa de snippets", "nhan khoa de snippets", "phan hoa de snippets", "phan khoa dr snippets", "phan khoa he snippets", "phan 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: (((("phan 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: (((("phan khoa de snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( phan khoa de snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("phan khoa de snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.