Perhaps you should try some spelling variations:
nam thuoc » nam thuc, nam thu, nha thuoc
lam duoc » nam duoc, luat duoc, lam thuoc
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
te sach » toc sach
hanh va » hang va, hanh vi
tay hoi » tay ho, tao hoi, tay thai
ky dang » ky nang, ky danh
ty dong » tay dong, tu dong, ly dong
cua tre » cua te, cuu tre, cua triet
va cua » va chua, via cua, ca cua

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 ((ty dong) or (ky dang)) tay hoi. hieu van ((lam duoc) or (nam thuoc)) van hanh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty dong) OR (ky dang)) tay hoi. hieu van ((lam duoc) OR (nam thuoc)) van hanh va cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ((ty dong) or (ky dang)) tay hoi. hieu van ((lam duoc) or (nam thuoc)) van hanh va cua tre*.