Perhaps you should try some spelling variations:
"trinh cau phan snippets" » "trinh chat phan snippets", "trinh chao phan snippets", "trinh tu phan snippets", "trinh chau phan snippets", "trinh cuu phan snippets", "trinh cac phan snippets", "trinh cau phan slippers"
"dung ung code snippets" » "dung trung code snippets", "dung quang code snippets", "dung chung code snippets", "dung ung co snippets", "dung ung 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 phan snippets") or ("dung ung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh cau phan snippets") OR ("dung ung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh cau phan snippets ) or ( dung ung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh cau phan snippets") or ("dung ung code snippets"))) or ("locating bug code snippets"))*.