Perhaps you should try some spelling variations:
"trinh phan hoi snippets" » "trinh han hoi snippets", "trinh quan hoi snippets", "thanh phan hoi snippets", "trinh phan phoi snippets", "trinh phan thoi snippets", "trinh phan hoa snippets"
"dung dung de snippets" » "duong dung de snippets", "ung dung de snippets", "dung ung de snippets", "dung dung he snippets", "dung dung dat snippets"
"locating bug code snippets" » "locating bung code snippets", "locating bugs 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 phan hoi snippets") or ("dung dung de snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh phan hoi snippets") or ("dung dung de snippets"))) or ("locating bug code snippets"))*.