Perhaps you should try some spelling variations:
doanh khoa » toan khoa
thanh toan » thanh hoa, thanh san, tinh toan
hoa doanh » toan doanh, hoa dan
thanh van » thanh san, thanh phan, thanh nhan
sach hoc » cach hoc, sach hoi, mach hoc
cuu tong » cuu cong, cuu tinh, huu tung
tong hoa » thong hoa, trong hoa, tong hop
khoa hoc » hoa hoc
su sach » so sach, vu sach
hai van » thai van, ha van, hai tan
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach hoc tap, nghien cuu tong hoa doanh khoa hoc xa hai van ((thanh van) OR (thanh toan))~".
• Adding a wildcard symbol may retrieve word variants: su sach hoc tap, nghien cuu tong hoa doanh khoa hoc xa hai van ((thanh van) OR (thanh toan))*.