Perhaps you should try some spelling variations:
"nhung bai qua van. nguoi tuong cho mot" » "nhung bai qua van. nguoi thuong cho mot", "nhung bai qua van. nguoi muong cho mot", "nhung bai qua van. nguoi thong cho mot", "nhung bai qua van. nguoi tuong ho mot", "nhung bai qua van. nguoi luong cho mot", "nhung bai qua van. nguoi trong cho mot", "nhung bai cua van. nguoi tuong cho mot", "nhung mai qua van. nguoi tuong cho mot", "nhung hai qua van. nguoi tuong cho mot", "nhung bai quan van. nguoi tuong cho mot", "nhung bai qua ban. nguoi tuong cho mot", "nhung bai qua san. nguoi tuong cho mot", "nhung bai qua van. nguoi tuong cho moi"
"nhung loi luan van. noi trung hoc o" » "nhung bi luan van. noi trung hoc o", "nhung gi luan van. noi trung hoc o", "nhung bo luan van. noi trung hoc o", "nhung loi luan van. doi trung hoc o", "nhung loi luan van. nhi trung hoc o", "nhung loi luan van. hoi trung hoc o", "nhung loi luan van. noi trung quoc o", "nhung li luan van. noi trung hoc o", "nhung hoi luan van. noi trung hoc o", "nhung loi lan van. noi trung hoc o", "nhung loi luan van. noi trung hoc co", "nhung loi luan van. noi trung hoc bo", "nhung loi luan van. noi trung hoc do"

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("nhung loi luan van. noi trung hoc o") or ("nhung bai qua van. nguoi tuong cho mot"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("nhung loi luan van. noi trung hoc o") OR ("nhung bai qua van. nguoi tuong cho mot")).
• Removing quotes may allow a broader search: (( nhung loi luan van. noi trung hoc o ) or ( nhung bai qua van. nguoi tuong cho mot )).
• Adding a wildcard symbol may retrieve word variants: (("nhung loi luan van. noi trung hoc o") or ("nhung bai qua van. nguoi tuong cho mot"))*.