Perhaps you should try some spelling variations:
nam thuoc » nam thu, nha thuoc, cay thuoc
thanh van » thanh san, thanh toan, thanh phan
hieu van » hieu va, thien van, lieu va
nam thuc » am thuc, nam thu, nam tu
va thanh » gia thanh, ban thanh, va tinh
van cua » vang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
cao hoc » co hoc, cho hoc, chat hoc
cai ky » cao ky, cac ky, cam ky
co hoi » co hoc, co loi
tu cai » tu cac, tu can, tu bai

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu cai ky nang ((co hoi) OR (cao hoc)). hieu van ((nam thuc) OR (nam thuoc)) va thanh van cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu cai ky nang ((co hoi) or (cao hoc)). hieu van ((nam thuc) or (nam thuoc)) va thanh van cua tre*.