Perhaps you should try some spelling variations:
"dung tren phi snippets" » "dung trong phi snippets", "dung trung phi snippets", "dung tren thi snippets", "dung tren phan snippets", "dung tren moi snippets", "dung tren phi slippers"
"dung vbugs code snippets" » "dung vbugs code slippers", "dung vbungs code snippets", "dung vbugss code snippets"
"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 vbugs code snippets") or ("dung tren phi snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung vbugs code snippets") OR ("dung tren phi snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung vbugs code snippets ) or ( dung tren phi snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung vbugs code snippets") or ("dung tren phi snippets"))) or ("locating bug code snippets"))*.