Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh dai » hanh tai, hanh dao, vanh dai
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
van hac » van hoc, van ha, van hai
hac tac » cac tac, hoc tach, thac cac
da hanh » dao hanh, da thanh, dan hanh
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su xac
su cac » tu cac, su cao, su can

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: ((su sac) OR (su cac)) ky tang xa hoi. hieu van hac tac da hanh dai cua tre~.
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su cac)) ky tang xa hoi. hieu van hac tac da hanh dai cua tre*.