Perhaps you should try some spelling variations:
ban thanh » ban hanh
hoc sach » hoc sinh, hoc cac, hoc anh
ban hang » ngan hang
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
sach ky » sac ky, sach y, sach ty
ky dang » ky nang, ky danh
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, me hoi
vai va » mai va, dai va, hai va
thiet » thieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ky dang ((ma hoi) or (ma hoa)). hieu ve cam luc ((ban thanh) or (ban hang)) vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ky dang ((ma hoi) OR (ma hoa)). hieu ve cam luc ((ban thanh) OR (ban hang)) vai va thiet.
• Adding a wildcard symbol may retrieve word variants: hoc sach ky dang ((ma hoi) or (ma hoa)). hieu ve cam luc ((ban thanh) or (ban hang)) vai va thiet*.