Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
thanh de » hanh de, thanh ve, thanh do
ve cham » va cham, ve chat, vu cham
nang ma » sang ma, nang cao, mang may
tang ma » mang may, tang van
vuc ban » vu ban, duc ban, cuc ban
sach ky » sac ky, sach y, sach ty
ve cam » ve cac, va cam, ve cai
de cua » le cua, te cua, dieu cua

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: thu sach ky ((nang ma) OR (tang ma)) hoi. hieu ((ve cam) OR (ve cham)) vuc ban thanh de cua vat~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((nang ma) or (tang ma)) hoi. hieu ((ve cam) OR (ve cham)) vuc ban thanh de cua vat~".
• Adding a wildcard symbol may retrieve word variants: thu sach ky ((nang ma) or (tang ma)) hoi. hieu ((ve cam) OR (ve cham)) vuc ban thanh de cua vat*.