Perhaps you should try some spelling variations:
khau thong » khau thuong, khap thong, khau tong
thuc thanh » thuoc thanh, thuc hanh, phuc thanh
thanh khoa » thanh hoa, thanh pho, hang khoa
tac thuoc » tao thuoc, truc thuoc, tac thuong
thuoc ban » thuoc tan, thuoc dang, thu ban
pho thong » he thong
sach tac » sach bac, sach tai, sach tham
sach nam » sach nay, sach tham, sach nang
nam thuc » nam thuoc, am thuc, nam thu
khoa pho » khoa phu, khoa khoa, khoa phau
tu sach » thu sach, su sach, te sach
co khau » co kha, co hau, cau khau
ban co » ban do, san co

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach tac thuoc ban co khau thong ) or ( tu sach nam thuc thanh khoa pho thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tac thuoc ban co khau thong ) OR ( tu sach nam thuc thanh khoa pho thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tac thuoc ban co khau thong ) or ( tu sach nam thuc thanh khoa pho thong ))*.