Perhaps you should try some spelling variations:
"dung vi trong snippets" » "dung vai trong snippets", "dung voi trong snippets", "dung bi trong snippets", "dung va trong snippets", "dung viet trong snippets", "dung tai trong snippets", "dung vi trong slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac 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 vi trong snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung vi trong snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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