Perhaps you should try some spelling variations:
doanh khoa » toan khoa
khoan phai » khong phai, khoa phau, khoan hoi
phai thong » phap thong, phai tuong, phan thong
bai thuoc » ban thuoc, bai hoc, cay thuoc
thuoc cao » thuoc co, thuc cao, thuoc bao
cao khoan » cac khoan, cao khoa, tao khoang
sanh tai » sang tai, hanh tai, anh tai
vu doanh » va doanh, su doanh, van doanh
sach bai » sach dao, cac bai, sach xa
so sanh » do sanh
khoa he » hoa he, khoa hoc, khong he
te sach » toc sach
tai vu » tai tu, thi vu, hai vu

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 tai vu doanh khoa he thong ) or ( te sach bai thuoc cao khoan phai thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh tai vu doanh khoa he thong ) OR ( te sach bai thuoc cao khoan phai thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh tai vu doanh khoa he thong ) or ( te sach bai thuoc cao khoan phai thong ))*.