Perhaps you should try some spelling variations:
doanh khoa » toan khoa
hoc doanh » hoa doanh, hoc danh, hoc dan
sach hoc » cach hoc, sach hoi, mach hoc
cuu dong » cuu cong, cuu tong, cuu long
dong hoc » dong co, dong luc
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
so sach » so sanh, bo sach, co sach
ma hop » mau hop, va hop

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach hoc tap, nghien cuu dong hoc doanh khoa hoc ((ma hop) OR (ma hoa)) benh nhan dan~.
• Adding a wildcard symbol may retrieve word variants: so sach hoc tap, nghien cuu dong hoc doanh khoa hoc ((ma hop) or (ma hoa)) benh nhan dan*.