Perhaps you should try some spelling variations:
thuoc dang » thuoc dung, thuoc khang, thuc dan
bai thuoc » ban thuoc, bai hoc, cay thuoc
dang khoi » dung khoa, hang khoa
phu thong » pho thong, phap thong, khau thong
sanh dai » sinh dai, sanh dan, vanh dai
dai thua » dai thu, dai thuc, dai cua
thua cac » thuat cam, thuan cam, thuat cao
cac khoi » cac thoi, cac khoan, cach thoi
khoi phu » hoi phu, khoa phu, khoe phu
so sanh » do sanh
khoi he » khoa he, khoi de, khong he
su cac » tu cac, su cao, su can

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 dai thua cac khoi he thong ) or ( su cac bai thuoc dang khoi phu thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sanh dai thua cac khoi he thong ) OR ( su cac bai thuoc dang khoi phu thong )).
• Adding a wildcard symbol may retrieve word variants: (( so sanh dai thua cac khoi he thong ) or ( su cac bai thuoc dang khoi phu thong ))*.