Perhaps you should try some spelling variations:
"trinh cau phi snippets" » "trinh chat phi snippets", "trinh chao phi snippets", "trinh tu phi snippets", "trinh chau phi snippets", "trinh cau thi snippets", "trinh chau phu snippets", "trinh cau phi 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 cau phi snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))~.
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• Adding a wildcard symbol may retrieve word variants: (((("trinh cau phi snippets") or ("dung dung code snippets"))) or ("locating bug code snippets"))*.