Perhaps you should try some spelling variations:
"dung phap thiet snippets" » "dung phan thiet snippets", "dung phap viet snippets", "dung phap hieu snippets", "dung phat thiet snippets", "dung nhan thiet snippets", "dung phap thiet 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.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("using c code snippets") or ("dung phap thiet snippets"))) or ("locating bug code snippets"))~.
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