Perhaps you should try some spelling variations:
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
cua tre » cua te, cuu tre, cua triet
hac tuc » thac toc, thai tuc
vai cua » dai cua, hai cua, lai cua
su sach » so sach, vu sach
lang xa » dang xay, lang van
lang ha » long ha
tuc ban » thuc ban, truc ban, tu ban
hieu va » lieu va, hieu qua
su sac » su cac, su xac
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 sac) OR (su sach)) ky ((lang xa) OR (lang ha)) hoi. hieu va hac tuc ban hanh vai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sac) or (su sach)) ky ((lang xa) OR (lang ha)) hoi. hieu va hac tuc ban hanh vai cua tre~".
• Adding a wildcard symbol may retrieve word variants: ((su sac) or (su sach)) ky ((lang xa) OR (lang ha)) hoi. hieu va hac tuc ban hanh vai cua tre*.