Perhaps you should try some spelling variations:
doanh hoan » doanh doanh, doanh khoa, doanh nhan
cong suat » nang suat, cong cua
hanh hoc » thanh hoc, hinh hoc, anh hoc
cong san » cong tac
hoan hoc » hoa hoc, toan hoc, hoang hoa
nhan van » nhan dan, nhan va, phan van
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 suat) OR (cong san)) doanh hoan hoc ma hoi va nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu hanh hoc tap, nghien cuu ((cong suat) OR (cong san)) doanh hoan hoc ma hoi va nhan van".
• Adding a wildcard symbol may retrieve word variants: tu hanh hoc tap, nghien cuu ((cong suat) OR (cong san)) doanh hoan hoc ma hoi va nhan van*.