Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
mai khoi » mai khoa, tai khoa, cac khoi
tu sach » thu sach, su sach, te sach
cam dua » ca dua, cay dua, chay dua
hoi cuu » hoi chu, hoi cua, hoi cau
dua ban » dia ban, cua ban, qua ban
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
mai hoi » dai hoi, lai hoi, mai doi
ho cuu » ho chu, ho cua, so cuu
ve cam » ve cham, ve cac, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((mai hoi) OR (mai khoi)). hieu ve cam dua ban thanh ((hoi cuu) OR (ho cuu)) tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((mai hoi) OR (mai khoi)). hieu ve cam dua ban thanh ((hoi cuu) or (ho cuu)) tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((mai hoi) OR (mai khoi)). hieu ve cam dua ban thanh ((hoi cuu) or (ho cuu)) tre*.