Perhaps you should try some spelling variations:
"luan khoa code snippets" » "khuan khoa code snippets", "toan khoa code snippets", "luan hoan code snippets", "luan khoa cong snippets", "luan khoa co snippets", "luan khoa de snippets", "luan 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: (((("luan 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: (((("luan khoa code snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan khoa code snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan khoa code snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.