Perhaps you should try some spelling variations:
"cong trong duan snippets" » "cong thuong duan snippets", "cong trinh duan snippets", "dung trong duan snippets", "cong trong quan snippets", "cong trong dan snippets", "cong trong tuan snippets", "cong trong duan slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung 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: (((("cong trong duan snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("cong trong duan snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("cong trong duan snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.