Perhaps you should try some spelling variations:
"dung toan va snippets" » "dung doanh va snippets", "dung thang va snippets", "dung thanh va snippets", "dung doan va snippets", "dung tran van snippets", "dung toan ban snippets", "dung toan va 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 toan va 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 toan va snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung toan va snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.