Perhaps you should try some spelling variations:
"cong trinh code snippets" » "cong trinh cong snippets", "cong trinh co snippets", "cong trinh cad snippets", "cong trinh code slippers"
"dung viet dat snippets" » "nang viet dat snippets", "cong viet dat snippets", "mang viet dat snippets", "dung viec dat snippets", "dung viet da snippets", "dung viet dao snippets", "dung viet dat 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 viet dat snippets") or ("cong trinh code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung viet dat snippets") OR ("cong trinh code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung viet dat snippets ) or ( cong trinh code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung viet dat snippets") or ("cong trinh code snippets"))) or ("locating bug code snippets"))*.