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 duoc dan snippets" » "dong duoc dan snippets", "cung duoc dan snippets", "dung quoc dan snippets", "dung duc dan snippets", "dung duoc ban snippets", "dung duoc dai snippets", "dung duoc dan slippers"
"locating bug code snippets" » "locating bug code slippers", "locating bung code snippets", "locating bugs code snippets"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung duoc dan 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 duoc dan snippets") OR ("cong trinh code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung duoc dan snippets ) or ( cong trinh code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung duoc dan snippets") or ("cong trinh code snippets"))) or ("locating bug code snippets"))*.