Perhaps you should try some spelling variations:
tien thuoc » trien thuoc, tin thuoc, bien thuoc
thuoc dang » thuoc dung, thuoc khang, thuc dan
thuoc sach » hoc sach, nuoc sach, thuat sach
kham thong » khap thong, khau thong, pham thuong
sach tien » sach tren, sach thieu
khau sach » hau sach, khoa sach, pham sach
tai thuoc » tri thuoc, bai thuoc, tac thuoc
sach khoa » bach khoa, sach nha, anh khoa
khoa kham » kho khan, khoa than
dang hoa » dang hoai, dang khoa, dong hoa
hoc cong » hoc co, cac cong, hoc dung
sach tai » sach bai, sach tham, sach dao
tu sach » thu sach, su sach, te sach

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 dang hoa hoc cong ) or ( khau sach tai thuoc sach khoa kham thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach tien thuoc dang hoa hoc cong ) OR ( khau sach tai thuoc sach khoa kham thong )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach tien thuoc dang hoa hoc cong ) or ( khau sach tai thuoc sach khoa kham thong ))*.