Perhaps you should try some spelling variations:
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 sai » su tai, su hai, su dai
sai ky » sac ky
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sai ky tang xa hoi. hieu ((ve cam) or (va cam)) dua ((ban hanh) OR (ban hang)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky tang xa hoi. hieu ((ve cam) OR (va cam)) dua ((ban hanh) OR (ban hang)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky tang xa hoi. hieu ((ve cam) or (va cam)) dua ((ban hanh) OR (ban hang)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: su sai ky tang xa hoi. hieu ((ve cam) or (va cam)) dua ((ban hanh) OR (ban hang)) hai cua tre*.