Perhaps you should try some spelling variations:
"dong trinh duoc snippets" » "cong trinh duoc snippets", "dong tinh duoc snippets", "dong tranh duoc snippets", "dong trinh doc snippets", "dong trinh duc snippets", "dong trinh quoc snippets", "dong trinh duoc slippers"
"using c code snippets" » "using lc code snippets", "using a code snippets", "using _ code snippets", "using cfd code snippets", "using c code 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: (((("using c code snippets") or ("dong trinh duoc snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using c code snippets") OR ("dong trinh duoc snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using c code snippets ) or ( dong trinh duoc snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using c code snippets") or ("dong trinh duoc snippets"))) or ("locating bug code snippets"))*.