Perhaps you should try some spelling variations:
thanh vien » nhan vien, thanh van
thuoc dan » thuoc dang, thuc dan, thuoc ban
nam thuoc » nam thuc, nam thu, nha thuoc
thanh ve » hanh ve, thanh va, thanh van
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
tu cai » tu cac, tu can, tu bai
cai ky » cao ky, cac ky, cam ky
va nam » van nam, ha nam, va nay

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 ((cao hoi) OR (co hoc)). hieu va nam thuoc dan ((thanh ve) OR (thanh vien)) cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cai ky nang ((cao hoi) or (co hoc)). hieu va nam thuoc dan ((thanh ve) OR (thanh vien)) cua tre~".
• Adding a wildcard symbol may retrieve word variants: tu cai ky nang ((cao hoi) or (co hoc)). hieu va nam thuoc dan ((thanh ve) OR (thanh vien)) cua tre*.