Perhaps you should try some spelling variations:
"trinh toan code snippets" » "tinh toan code snippets", "thanh toan code snippets", "trinh han code snippets", "trinh toan co snippets", "trinh toan cong snippets", "trinh toan de snippets", "trinh toan code slippers"
"dung van dat snippets" » "duong van dat snippets", "dung va dat snippets", "dang van dat snippets", "dung van dao snippets", "dung van dau snippets", "dung dan dat snippets", "dung van dat 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 toan code snippets") or ("dung van dat snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh toan code snippets") OR ("dung van dat snippets"))) OR ("locating bug code snippets")).
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