Perhaps you should try some spelling variations:
doanh hoan » doanh doanh, doanh khoa, doanh luan
cong luat » cong suat, cong luan, cuong luan
hanh hoc » thanh hoc, hinh hoc, anh hoc
cuu cong » cua cong, thu cong, cac cong
nhan dan » phan dau, gian dan, nhan tai
tu hanh » du hanh, lu hanh, thuc hanh
va nhan » van nhan, ca nhan, va phan
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu hanh hoc tap, nghien cuu cong luat ((doanh hoan) or (doanh nhan)) hoc ma hoi va nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu hanh hoc tap, nghien cuu cong luat ((doanh hoan) OR (doanh nhan)) hoc ma hoi va nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu hanh hoc tap, nghien cuu cong luat ((doanh hoan) or (doanh nhan)) hoc ma hoi va nhan dan*.