Perhaps you should try some spelling variations:
"trinh lap doanh snippets" » "trinh luat doanh snippets", "trinh luan doanh snippets", "trinh phap doanh snippets", "trinh nhap doanh snippets", "trinh tap doan snippets", "trinh lap doanh slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung 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 lap doanh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh lap doanh snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh lap doanh snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.