Perhaps you should try some spelling variations:
"trinh de hoc snippets" » "trinh den hoc snippets", "trinh do hoc snippets", "trinh he hoc snippets", "trinh te hoc snippets", "trinh du hoc snippets", "trinh dien hoc 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 de hoc snippets") or ("dung bug code snippets"))) or ("locating bug code snippets"))~.
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