Perhaps you should try some spelling variations:
ban thanh » ban hang
cham duc » pham duc, cham soc, pham duy
ban hanh » ban hang
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
su ban » su bang, tu ban, vu ban
ban ky » van ky, dan ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su ban ky tang xa hoi. hieu ve cham duc ((ban thanh) or (ban hanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ban ky tang xa hoi. hieu ve cham duc ((ban thanh) OR (ban hanh)) hai cua tre.
• Adding a wildcard symbol may retrieve word variants: su ban ky tang xa hoi. hieu ve cham duc ((ban thanh) or (ban hanh)) hai cua tre*.