Perhaps you should try some spelling variations:
"dung chouc code snippets" » "dung cho code snippets", "dung hoc code snippets", "dung coc code snippets", "dung chouc core snippets", "dung chouc code slippers"
"dung cac nhan snippets" » "luong cac nhan snippets", "dung cho nhan snippets", "dung tai nhan snippets", "dung ca nhan snippets", "dung cac nha snippets", "dung cam nhan snippets", "dung cac nhan slippers"
"locating bug code snippets" » "locating bug core 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 chouc code snippets") or ("dung cac nhan snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("dung chouc code snippets") OR ("dung cac nhan snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung chouc code snippets") or ("dung cac nhan snippets"))) or ("locating bug code snippets"))*.