Perhaps you should try some spelling variations:
"trinh phap phan snippets" » "trinh phan phan snippets", "trinh han phan snippets", "trinh chat phan snippets", "trinh phap phat snippets", "trinh phap hoan snippets", "trinh phap luan snippets", "trinh phap phan 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: (((("trinh phap phan snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh phap phan snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh phap phan snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.