Perhaps you should try some spelling variations:
"chuong trinh do snippets" » "cong trinh do snippets", "chuong trinh ky snippets"
"using cfd code snippets" » "using 3d code snippets", "using c code snippets", "using cfd core snippets"
"locating bug code snippets" » "locating bug core snippets", "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: (((("using cfd code snippets") or ("chuong trinh do snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using cfd code snippets") OR ("chuong trinh do snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using cfd code snippets ) or ( chuong trinh do snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using cfd code snippets") or ("chuong trinh do snippets"))) or ("locating bug code snippets"))*.