Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
kho tang » cao tang
ban hanh » ban hang
cua tre » cua te, cuu tre, cua triet
va khac » va khao, va kha, vu khac
ky lang » ky nang, ky dang, ky tang
tai cua » thai cua, tai cuc, tri cua
tu ban » thu ban, te ban
su sai » su tai, su hai, su dai
va hac » van hac, va cac, va 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: su sai ((ky lang) OR (kho tang)) xa hoi. hieu ((va hac) OR (va khac)) tu ban hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ((ky lang) or (kho tang)) xa hoi. hieu ((va hac) OR (va khac)) tu ban hanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sai ((ky lang) or (kho tang)) xa hoi. hieu ((va hac) OR (va khac)) tu ban hanh tai cua tre*.