Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
thanh vi » hanh vi, thanh va, thanh ve
van hau » van ha, van hai, van dau
hau vuc » hau vung
vuc van » duc van, luc van, thuc van
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
vi va » vi van, vai va, vu va
thiet » thieu

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 ((v nang) OR (cam nang)) ma hoi. hieu van hau vuc van thanh vi va thiet~.
• Adding a wildcard symbol may retrieve word variants: thu sach ((v nang) or (cam nang)) ma hoi. hieu van hau vuc van thanh vi va thiet*.