Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
tu cach » tu cac
hieu va » lieu va, hieu qua
va chao » va cao, va chat, va cham
cua tre » cua te, cuu tre, cua triet
xu van » tu van, vu van, su van
vi cua » vai cua, di cua

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 cach) OR (thu sach)) ky nang ((x ho) OR (xa hoi)). hieu va chao xu van hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky nang ((x ho) or (xa hoi)). hieu va chao xu van hanh vi cua tre*.