Perhaps you should try some spelling variations:
"dung tin java snippets" » "dong tin java snippets", "luong tin java snippets", "dung tren java snippets", "dung trinh java snippets", "dung think java snippets", "dung tin va snippets", "dung tin java slippers"
"cong san code snippets" » "cong tac code snippets", "cong san co snippets", "cong san cong snippets", "cong san code 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: (((("dung tin java snippets") or ("cong san code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung tin java snippets") OR ("cong san code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung tin java snippets ) or ( cong san code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung tin java snippets") or ("cong san code snippets"))) or ("locating bug code snippets"))*.