Perhaps you should try some spelling variations:
"dung java java snippets" » "dung va java snippets"
"luan van cong snippets" » "luan van dong snippets", "luan van phong snippets", "luan phan cong snippets", "quan van cong snippets", "lan van cong 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: (((("luan van cong 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 van cong snippets") OR ("dung java java snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( luan van cong snippets ) or ( dung java java snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("luan van cong snippets") or ("dung java java snippets"))) or ("locating bug code snippets"))*.