Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh thanh, dong doanh
doanh hoan » doanh khoa, doanh nhan, doanh luan
mach hoc » cach hoc, dich hoc, anh hoc
cuu nang » chuc nang, cam nang, cuu van
so doanh » so danh, su doanh, hoa doanh
phan dan » phan dang, phan dau, phan van
nhan dan » phan dau, gian dan, nhan tai
su mach » su sach
nang so » nang som, nang co, nang ho
hoan ma » hoan my, hoan va, hoang mai
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: su mach hoc tap, nghien cuu nang so doanh doanh hoan ma hoi va ((phan dan) or (nhan dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su mach hoc tap, nghien cuu nang so doanh doanh hoan ma hoi va ((phan dan) OR (nhan dan)).
• Adding a wildcard symbol may retrieve word variants: su mach hoc tap, nghien cuu nang so doanh doanh hoan ma hoi va ((phan dan) or (nhan dan))*.