Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
mua ban » cua ban, qua ban
van cau » van dau, van hau, van chat
nam mua » nam cua, nam qua, nam xua
va nam » van nam, ha nam, va nay
ma hoi » mai hoi, xa hoi, me hoi
va cau » va cac, va dau, 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: thu sach ky nang ((ma hoi) or (ma hoa)). lieu va nam mua ban thanh ((van cau) or (va cau)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((ma hoi) OR (ma hoa)). lieu va nam mua ban thanh ((van cau) OR (va cau)) tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((ma hoi) or (ma hoa)). lieu va nam mua ban thanh ((van cau) or (va cau)) tren*.