Perhaps you should try some spelling variations:
"trinh mach thoi snippets" » "tinh mach thoi snippets", "trinh lich thoi snippets", "trinh minh thoi snippets", "trinh cach thoi snippets", "trinh cac thoi snippets", "trinh sach hoi snippets", "trinh mach thoi 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 mach thoi 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 mach thoi snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh mach thoi snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.