Perhaps you should try some spelling variations:
"python using java snippets" » "python using data snippets"
"khoa co don snippets" » "hoa co don snippets", "khoa cong don snippets", "khoa hoc don snippets", "khoa co dong snippets", "khoa co dan snippets", "khoa co dot 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: (((("khoa co 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: (((("khoa co don snippets") OR ("python using java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khoa co don snippets ) or ( python using java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khoa co don snippets") or ("python using java snippets"))) or ("locating bug code snippets"))*.