Perhaps you should try some spelling variations:
"nhan dang code snippets" » "nhan dan code snippets", "phan dang code snippets", "tran dang code snippets", "nhan dang cong snippets", "nhan dang co snippets", "nhan dang de snippets", "nhan dang code slippers"
"dung bug code snippets" » "dung dung code snippets", "dung hung code snippets", "dung rung code snippets", "dung bug code slippers"
"locating bug code snippets" » "locating bug code slippers"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("dung bug code snippets") or ("nhan dang code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung bug code snippets") OR ("nhan dang code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( dung bug code snippets ) or ( nhan dang code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("dung bug code snippets") or ("nhan dang code snippets"))) or ("locating bug code snippets"))*.