Perhaps you should try some spelling variations:
thanh co » thanh ca, thanh ho, thanh vo
thanh do » thanh de, thanh pho, thanh hoa
lam duoc » nam duoc, luat duoc, lam thuoc
cua tre » cua te, cua triet, dua tren
so sach » so sanh, bo sach, co sach
duoc va » nuoc va, duc va, duoc ma
cao hoi » cau hoi, co hoi, cao hoc
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 co) OR (thanh do)) ((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 co) OR (thanh do)) ((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 co) OR (thanh do)) ((cua tre) or (cuu tre))*.