Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
van cam » van lam, van cau, van dam
cua tre » cua te, cuu tre, cua triet
su sac » su sach, su cac, su xac
sac ky » cac ky, sai 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 sac ky tang xa hoi. hieu ((van cam) OR (van nam)) xuc ((ban thanh) or (ban hanh)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang xa hoi. hieu ((van cam) OR (van nam)) xuc ((ban thanh) OR (ban hanh)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky tang xa hoi. hieu ((van cam) OR (van nam)) xuc ((ban thanh) or (ban hanh)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky tang xa hoi. hieu ((van cam) OR (van nam)) xuc ((ban thanh) or (ban hanh)) dai cua tre*.