Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cham truc » cau truc, nham thuc, pham thuc
thanh di » thanh doi, thanh de, thanh do
truc ban » thuc ban, truc dan, truc van
so sach » bo sach, co sach, hoc sach
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
vu nang » vuc nang, va nang, vu dang
so sanh » do sanh
ma hoi » xa hoi, ma hoa, me hoi
di cua » dai cua, doi cua, de cua
cua te » cua tu

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: ((so sach) OR (so sanh)) vu nang ((ma hoi) OR (mai hoi)). hieu ve cham truc ban thanh di cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (so sanh)) vu nang ((ma hoi) OR (mai hoi)). hieu ve cham truc ban thanh di cua te~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) vu nang ((ma hoi) OR (mai hoi)). hieu ve cham truc ban thanh di cua te*.