Perhaps you should try some spelling variations:
"dong trong duan snippets" » "duong trong duan snippets", "dung trong duan snippets", "cong trong duan snippets", "dong trong quan snippets", "dong trong dan snippets", "dong trong tuan snippets", "dong 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: (((("dong 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: (((("dong 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: (((("dong trong duan snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.