Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai 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 nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
va hac » van hac, va khac, va cac
su dai » sau dai, si dai, su tai
su sai » su tai, su hai, su mai

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