Perhaps you should try some spelling variations:
"dung cau hoang snippets" » "dung cam hoang snippets", "dung cap hoang snippets", "dung cau hoa snippets", "dung chau hoang snippets", "dung cu hoang snippets", "dung cau hoang 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 cau hoang 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 cau hoang snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("dung cau hoang snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.