Perhaps you should try some spelling variations:
"trinh quan doanh snippets" » "tinh quang doanh snippets", "trinh luat doanh snippets", "trinh han doanh snippets", "trinh quan doan snippets", "trinh nhuan doanh snippets", "trinh quan hoang snippets", "trinh quan doanh 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 quan doanh 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 quan doanh snippets") OR ("dung cac code snippets"))) OR ("locating bug code snippets")).
• Removing quotes may allow a broader search: (((( trinh quan doanh snippets ) or ( dung cac code snippets ))) or ( locating bug code snippets )).
• Adding a wildcard symbol may retrieve word variants: (((("trinh quan doanh snippets") or ("dung cac code snippets"))) or ("locating bug code snippets"))*.