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"
"tang van code snippets" » "dang van code snippets", "hoang van code snippets", "trong van code snippets", "tang van de snippets", "tang van hoe snippets", "tang van cong snippets", "tang van 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: (((("dung vung code snippets") or ("tang van code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung vung code snippets") OR ("tang van code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung vung code snippets") or ("tang van code snippets"))) or ("locating bug code snippets"))*.