Perhaps you should try some spelling variations:
doanh doanh » toan doanh, doanh hoan, doanh thanh
thuat dai » thuat bai, thuat dam, thuat dan
thuat cai » thuat bai, thuat cam, thuat cao
hoc doanh » hoa doanh, hoc danh, hoc dan
doanh hoc » danh hoc, doanh khoa, doanh hoan
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
cac nhan » ca nhan, cac nha, cam nhan
nhan van » nhan dan, nhan va, phan van
hoi cac » hoc cac, voi cac, hoa cac
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 dai) OR (thuat cai)) hoc tap, nghien cuu cong hoc doanh doanh hoc ma hoi cac nhan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat dai) OR (thuat cai)) hoc tap, nghien cuu cong hoc doanh doanh hoc ma hoi cac nhan van".
• Adding a wildcard symbol may retrieve word variants: ((thuat dai) OR (thuat cai)) hoc tap, nghien cuu cong hoc doanh doanh hoc ma hoi cac nhan van*.