Perhaps you should try some spelling variations:
"trinh hanh doanh snippets" » "trinh thanh doanh snippets", "trinh han doanh snippets", "trinh anh doanh snippets", "trinh hang doanh snippets", "trinh chinh doanh snippets", "trinh doanh doanh snippets", "trinh hanh doanh slippers"
"dung cac code snippets" » "luong cac code snippets", "dung cho code snippets", "dung tai code snippets", "dung cac cong snippets", "dung cac co snippets", "dung cac che snippets", "dung cac 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 hanh doanh snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh hanh doanh snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh hanh doanh snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.