Perhaps you should try some spelling variations:
"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"
"dung tri danh snippets" » "dung tai danh snippets", "dung tren danh snippets", "nhung tri danh snippets", "dung tri doanh snippets", "dung tra danh snippets", "dung tri dinh snippets", "dung tri danh 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 cac code snippets") or ("dung tri danh snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung cac code snippets") OR ("dung tri danh snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung cac code snippets") or ("dung tri danh snippets"))) or ("locating bug code snippets"))*.