Perhaps you should try some spelling variations:
"trinh phan duoc snippets" » "trinh han duoc snippets", "trinh quan duoc snippets", "thanh phan duoc snippets", "trinh phan duc snippets", "trinh phan quoc snippets", "trinh nhan duoc snippets", "trinh phan 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 phan 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 phan 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 phan duoc snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.