Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh vi » hanh vi, thanh va, thanh ve
su sach » so sach, vu sach
may hoi » may thoi, tay hoi, mai hoi
ve cham » va cham, ve chat, vu cham
vu kham » vu khanh
duc ban » duc tan, duc van, dua ban
su tien » su kien, su hien, tu tieng
y mang » cay mang
vi su » va su, ve su, ki su

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: su sach y mang may hoi. hieu ((ve cham) OR (vu kham)) duc ban thanh vi su tien~.
• Adding a wildcard symbol may retrieve word variants: su sach y mang may hoi. hieu ((ve cham) or (vu kham)) duc ban thanh vi su tien*.