Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh thanh, dong doanh
doanh hoan » doanh khoa, doanh nhan, doanh luan
thuat dam » thuat cam, thuat do, thuat xay
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
cac nhan » ca nhan, cac nha, cam nhan
dam hoc » dai hoc, dan hoc, day hoc
hoi cac » hoc cac, voi cac, hoa cac
nhan va » nhan tai, nhan dan, nhan tao
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: thuat dam hoc tap, nghien cuu cong hoc ((doanh doanh) or (doanh hoan)) hoc ma hoi cac nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat dam hoc tap, nghien cuu cong hoc ((doanh doanh) OR (doanh hoan)) hoc ma hoi cac nhan va.
• Adding a wildcard symbol may retrieve word variants: thuat dam hoc tap, nghien cuu cong hoc ((doanh doanh) or (doanh hoan)) hoc ma hoi cac nhan va*.