Perhaps you should try some spelling variations:
tien thuoc » trien thuoc, tin thuoc, bien thuoc
khang khoa » hang khoa, khang kho, khong khoa
phap thong » phap phong, phap chong, pho thong
sach tien » sach tren, sach thieu
khoa phap » khoa phau, khoan phai, khong phap
cach thuc » anh thuc, cac thu
thuc thuc » hoc thuc
tai trong » tai truong, tai trung, tai cong
thuc anh » thuc hanh, thuy anh, thu anh
anh khoa » doanh khoa, hang khoa
khoa tai » khoa tap, khoe tai, khoa than
tu sach » thu sach, su sach, te sach
tu cach » tu cac

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 tien thuoc khang khoa phap thong ) or ( tu cach thuc thuc anh khoa tai trong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tien thuoc khang khoa phap thong ) OR ( tu cach thuc thuc anh khoa tai trong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tien thuoc khang khoa phap thong ) or ( tu cach thuc thuc anh khoa tai trong ))*.