Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
thanh vi » hanh vi, thanh va, thanh ve
hieu van » thien van, lieu va, hieu ve
va nang » van nang, da nang, cam nang
hieu va » lieu va, hieu qua
hau xuc » chat xuc
xuc van » duc van, luc van, vuc van
ma hoi » mai hoi, xa hoi, ma hoa
v nang » vu nang, van nang, voi nang
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 (va nang)) ma hoi. ((hieu van) OR (hieu va)) hau xuc van thanh vi va thiet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((v nang) or (va nang)) ma hoi. ((hieu van) OR (hieu va)) hau xuc van thanh vi va thiet~".
• Adding a wildcard symbol may retrieve word variants: thu sach ((v nang) or (va nang)) ma hoi. ((hieu van) OR (hieu va)) hau xuc van thanh vi va thiet*.