Perhaps you should try some spelling variations:
"trinh thuc viet snippets" » "trinh tu viet snippets", "trinh thi viet snippets", "trinh hoc viet snippets", "trinh thuc hien snippets", "trinh thuc vat snippets", "trinh thuc viet 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 thuc viet 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 thuc viet snippets") OR ("dung dung code snippets"))) OR ("locating bug code snippets")).
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