Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
hieu va » hieu qua
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
soc va » hoc va, loc va, doc va
o hoc » mo hoc, so hoc, y hoc

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: te sach y nang ((o hoc) OR (co hoc)). ((hieu va) OR (lieu va)) cham soc va hanh dai cua tre~.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((o hoc) or (co hoc)). ((hieu va) or (lieu va)) cham soc va hanh dai cua tre*.