Perhaps you should try some spelling variations:
nghien cac » nghiep cach, nghien cuu, nghiep cay
hoc khanh » hoc nhanh, hoc thanh, hoc hanh
phong hoa » phuong hoa, phong khoa, phong ho
cac dong » cac duong, cac cong, cac dang
dong hoc » dong co, dong luc
van phan » van phong, van thanh, luan phan
mai tap » bai tap, mai tat, mai tan
va nha » va nho, ve nha
bach » sach, cach, bac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu bach mai tap, nghien cac dong hoc khanh phong hoa xa hoi ((va nha) or (van phan)) van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach mai tap, nghien cac dong hoc khanh phong hoa xa hoi ((va nha) OR (van phan)) van.
• Adding a wildcard symbol may retrieve word variants: vu bach mai tap, nghien cac dong hoc khanh phong hoa xa hoi ((va nha) or (van phan)) van*.