Perhaps you should try some spelling variations:
"cong trinh cong snippets" » "cong trinh dung snippets"
"thong cfd code snippets" » "thong cad code snippets", "thong cua code snippets", "thong cac code snippets", "thong cfd core snippets"
"locating bug code snippets" » "locating bug core snippets", "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: (((("cong trinh cong snippets") or ("thong cfd code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong trinh cong snippets") OR ("thong cfd code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( cong trinh cong snippets ) or ( thong cfd code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("cong trinh cong snippets") or ("thong cfd code snippets"))) or ("locating bug code snippets"))*.