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