Perhaps you should try some spelling variations:
khau thuong » khac thuong, khai thuong, khau thong
thuoc cach » thuoc sach, thuc cach, truoc cach
tac thuoc » tao thuoc, truc thuoc, tac thuong
toc sach » doc sach, thuoc sach, nuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
cach han » cach hoan, sach han, cach van
han khau » san khau, nhap khau, nhan kham

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((toc sach) or (hoc sach)) tac thuoc cach han khau thuong~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (hoc sach)) tac thuoc cach han khau thuong*.