Perhaps you should try some spelling variations:
"nhat anh trac snippets" » "nhat hanh trac snippets", "nhat minh trac snippets", "nhat ban trac snippets", "nhat sinh trac snippets", "nhat anh tuan snippets", "nhat anh thuc snippets", "nhat anh trac 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 ("nhat anh trac snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using c code snippets") OR ("nhat anh trac snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( using c code snippets ) or ( nhat anh trac snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("using c code snippets") or ("nhat anh trac snippets"))) or ("locating bug code snippets"))*.