Perhaps you should try some spelling variations:
"khuan khoa code snippets" » "khuan khoa cong snippets", "khuan khoa co snippets", "khuan khoa de snippets", "chuan khoa code snippets", "thuan khoa code snippets", "khoan khoa code snippets", "khuan khoa code slippers"
"dung java java snippets" » "dung va java snippets", "dung java java slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code 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: (((("khuan khoa code snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("khuan khoa code snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( khuan khoa code snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("khuan khoa code snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.