Perhaps you should try some spelling variations:
"dung nhan code snippets" » "dung luan code snippets", "dung nhan co snippets", "dung nhan con snippets", "dung nhan code slippers"
"gian bug code snippets" » "gian vung code snippets", "gian hung code snippets", "gian xu code snippets", "gian 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: (((("gian bug code snippets") or ("dung nhan code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("gian bug code snippets") OR ("dung nhan code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( gian bug code snippets ) or ( dung nhan code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("gian bug code snippets") or ("dung nhan code snippets"))) or ("locating bug code snippets"))*.