Perhaps you should try some spelling variations:
"trinh dong duoc snippets" » "trinh duong duoc snippets", "trinh dung duoc snippets", "trinh cong duoc snippets", "trinh dong quoc snippets", "trinh dong duong snippets", "trinh trong duoc snippets", "trinh dong duoc 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 dong duoc 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 dong duoc snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
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• Adding a wildcard symbol may retrieve word variants: (((("trinh dong duoc snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.