Perhaps you should try some spelling variations:
"trinh hanh luan snippets" » "trinh thanh luan snippets", "trinh han luan snippets", "trinh anh luan snippets", "trinh khanh luan snippets", "trinh hang luan snippets", "trinh hanh luat snippets", "trinh hanh luan 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 hanh luan 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 hanh luan snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh hanh luan snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh hanh luan snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.