Perhaps you should try some spelling variations:
"dung cong nhan snippets" » "dung trong nhan snippets", "dung cong nhat snippets", "dung cong thanh snippets", "dung cong san snippets", "dung cong nhan slippers"
"trinh cau code snippets" » "trinh chat code snippets", "trinh chao code snippets", "trinh tu code snippets", "trinh cau cong snippets", "trinh cau de snippets", "trinh cfd code snippets", "trinh cau 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 cong nhan snippets") or ("trinh cau code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cong nhan snippets") OR ("trinh cau code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung cong nhan snippets ) or ( trinh cau code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung cong nhan snippets") or ("trinh cau code snippets"))) or ("locating bug code snippets"))*.