Perhaps you should try some spelling variations:
"dung vung code snippets" » "dung ung code snippets", "dung dung code snippets", "dung hung code snippets", "dung vung co snippets", "dung vung code slippers"
"dung tu trong snippets" » "dung tu tuong snippets", "dung tu tieng snippets", "dung thu trong snippets", "dung tru trong snippets", "dung cu trong snippets", "dung tu trong 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: (((("dung vung code snippets") or ("dung tu trong snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung vung code snippets") OR ("dung tu trong snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung vung code snippets") or ("dung tu trong snippets"))) or ("locating bug code snippets"))*.