Perhaps you should try some spelling variations:
"dung doan viet snippets" » "dung doanh viet snippets", "dung dan viet snippets", "dung toan viet snippets", "dung khoan viet snippets"
"using c code snippets" » "using lc code snippets", "using a code snippets", "using _ code snippets", "using cfd code snippets"
"locating bug code slippers" » "locating bung code slippers", "locating bugs code slippers"

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 ("dung doan viet snippets"))) or ("locating bug code slippers"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using c code snippets") OR ("dung doan viet snippets"))) OR ("locating bug code slippers")).
• Removing quotes may allow a broader search: (((( using c code snippets ) or ( dung doan viet snippets ))) or ( locating bug code slippers )).
• Adding a wildcard symbol may retrieve word variants: (((("using c code snippets") or ("dung doan viet snippets"))) or ("locating bug code slippers"))*.