Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
ban hanh » ban hang
kho tang » cao tang
hieu va » lieu va, hieu qua
tai cua » thai cua, tai cuc, tri cua
tuc ban » thuc ban, truc ban, tu ban
hac tuc » thac toc, thai tuc
cua tre » cua te, cuu tre, cua triet
ky tang » ky dang, ky trong, tay tang
va hac » van hac, va khac, va cac
su sai » su tai, su hai, su dai

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 tang) OR (ky nang))) OR (kho tang)) xa hoi. hieu va hac tuc ban hanh tai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ((((ky tang) OR (ky nang))) or (kho tang)) xa hoi. hieu va hac tuc ban hanh tai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sai ((((ky tang) OR (ky nang))) or (kho tang)) xa hoi. hieu va hac tuc ban hanh tai cua tre*.