Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
tien thuoc » trien thuoc, tin thuoc, bien thuoc
thuoc dang » thuoc dung, thuoc khang, thuc dan
phap phong » hai phong, phap phan
sanh thai » sinh thai, anh thai, nhanh thai
hang khoa » dung khoa
khoa khau » khoa kham, khoa phau, khoa chau
sach tien » sach tren, sach thieu
dang khoa » dung khoa, dang khoi, dong khoa
khoa phap » khoa phau, khoan phai, khong phap
thai hoc » dai hoc, bai hoc, hoi hoc
hoc hang » hoc hanh, hoc bang, hoc tang
so sanh » do sanh
te sach » toc sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sanh thai hoc hang khoa khau thong ) or ( te sach tien thuoc dang khoa phap phong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh thai hoc hang khoa khau thong ) OR ( te sach tien thuoc dang khoa phap phong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh thai hoc hang khoa khau thong ) or ( te sach tien thuoc dang khoa phap phong ))*.