Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
lam duoc » nam duoc, luat duoc, lam thuoc
va thanh » gia thanh, va tinh, le thanh
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang
va lam » van lam, va lap

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: so sach y nang cao hoi. lieu va lam duoc ((va thanh) OR (ban thanh)) co ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang cao hoi. lieu va lam duoc ((va thanh) OR (ban thanh)) co ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang cao hoi. lieu va lam duoc ((va thanh) OR (ban thanh)) co ((cua tre) or (cuu tre))*.