Perhaps you should try some spelling variations:
ban hanh » ban hang
kho tang » cao tang
ky lang » ky nang, ky dang, ky tang
lai cua » dai cua, hai cua, lai chau
vai cua » dai cua, hai cua, bai cua
hieu va » lieu va, hieu qua
hac tuc » thac toc, thai tuc
tuc ban » thuc ban, truc ban, tu ban
su sai » su tai, su hai, su dai
va hac » van hac, va khac, va cac

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 tuc ban hanh ((vai cua) OR (lai 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 tuc ban hanh ((vai cua) OR (lai cua)) tre~".
• Adding a wildcard symbol may retrieve word variants: su sai ((ky lang) or (kho tang)) xa hoi. hieu va hac tuc ban hanh ((vai cua) OR (lai cua)) tre*.