Perhaps you should try some spelling variations:
"dung trong code snippets" » "dung trong cong snippets", "dung trong co snippets", "dung trong che snippets", "dung trong code slippers"
"trinh cau nhan snippets" » "trinh chat nhan snippets", "trinh chao nhan snippets", "trinh tu nhan snippets", "trinh chau nhan snippets", "trinh ca nhan snippets", "trinh cu nhan snippets", "trinh cau nhan 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 cau nhan snippets") or ("dung trong code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cau nhan snippets") or ("dung trong code snippets"))) or ("locating bug code snippets"))*.