Perhaps you should try some spelling variations:
ban thanh » ban hanh
ban hang » ngan hang
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hai cua » thai cua, dai cua, hoi cua
su sac » su sach, su cac, su xac
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky
va cai » va cac, va bai, va 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 sac ky tang xa hoi. hieu ((va cai) OR (va cam)) cua ((ban thanh) OR (ban hang)) hai cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang xa hoi. hieu ((va cai) or (va cam)) cua ((ban thanh) OR (ban hang)) hai cua tre~".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang xa hoi. hieu ((va cai) or (va cam)) cua ((ban thanh) OR (ban hang)) hai cua tre*.