Perhaps you should try some spelling variations:
"trinh toan duan snippets" » "tinh toan duan snippets", "thanh toan duan snippets", "trinh han duan snippets", "trinh toan quan snippets", "trinh toan luan snippets", "trinh toan doanh snippets", "trinh toan duan slippers"
"dung rung code snippets" » "dung trung code snippets", "duong rung code snippets", "dung ung code snippets", "dung rung 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 toan duan snippets") or ("dung rung code snippets"))) or ("locating bug code snippets"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("trinh toan duan snippets") OR ("dung rung code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh toan duan snippets ) or ( dung rung code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh toan duan snippets") or ("dung rung code snippets"))) or ("locating bug code snippets"))*.