Perhaps you should try some spelling variations:
"trinh tren doan snippets" » "trinh truyen doan snippets", "trinh tuyen doan snippets", "trinh tieng doan snippets", "trinh tran doan snippets", "trinh trien doanh snippets", "trinh trang doan snippets"
"dung bug code snippets" » "dung dung code snippets", "dung hung code snippets", "dung rung code snippets", "dung bug core snippets"
"locating bug code snippets" » "locating bug core snippets"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (((("trinh tren doan snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh tren doan snippets") OR ("dung bug code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh tren doan snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))*.