Perhaps you should try some spelling variations:
dung thuoc » dung hoc
phau thong » phap thong, khau thong, phan thong
pham thong » pham thuong, pham hong, pham trong
thuoc tan » thuoc tai, thuoc ban, thuoc tren
khoa phau » hoa phan, khoa kham, khoa than
sach tran » sach tranh, sach tren, vach tran
tran quoc » trung quoc, han quoc, tran duc
tan khoa » toan khoa, tran khoa, san khoa
quoc cac » duoc cac, luoc cac, quoc cao
thu pham » thuc pham, thu phan, thuc phan
te sach » toc sach
cac thu » cach thuc, cac thoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( te sach dung thuoc tan khoa phau thong ) or ( te sach tran quoc cac thu pham thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach dung thuoc tan khoa phau thong ) OR ( te sach tran quoc cac thu pham thong )).
• Adding a wildcard symbol may retrieve word variants: (( te sach dung thuoc tan khoa phau thong ) or ( te sach tran quoc cac thu pham thong ))*.