Perhaps you should try some spelling variations:
"trinh nhap thap snippets" » "trinh nha thap snippets", "trinh phap thap snippets", "trinh han thap snippets", "trinh nhap khau snippets", "trinh chap phap snippets", "trinh nhap nhan snippets", "trinh nhap thap slippers"
"dung dung code snippets" » "duong dung code snippets", "ung dung code snippets", "dung ung code snippets", "dung dung cong snippets", "dung dung co snippets", "dung dung de snippets", "dung dung 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 nhap thap snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh nhap thap snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.