Perhaps you should try some spelling variations:
ky tang » ky nang, ky dang, kho tang
ky danh » ky anh, ky dang
hieu va » lieu va, hieu qua
va cham » va chat, va tham
hoc ban » hoc bang, hoc dan, hoc bai
cua tre » cua te, cuu tre, cua triet
soc ba » toc ba, sac ba, soc va
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 cac ((ky tang) OR (ky danh)) xa hoi. hieu va cham ((soc ba) OR (hoc ban)) hanh vi cua tre~.
• Adding a wildcard symbol may retrieve word variants: tu cac ((ky tang) or (ky danh)) xa hoi. hieu va cham ((soc ba) or (hoc ban)) hanh vi cua tre*.