Perhaps you should try some spelling variations:
"dung dung quan snippets" » "duong dung quan snippets", "ung dung quan snippets", "dung ung quan snippets", "dung dung quang snippets", "dung dung luan snippets", "dung luong quan snippets", "dung dung quan 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"

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("using c code snippets") or ("dung dung quan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("using c code snippets") OR ("dung dung quan snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("using c code snippets") or ("dung dung quan snippets"))) or ("locating bug code snippets"))*.