Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
van hau » van ha, van hai, van dau
van cau » van dau, van chat, toan cau
te sach » toc sach
cam duc » cam xuc, cao duc, pham duc
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
van cam » van nam, van lam, van dam

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: te sach ((ky lang) OR (ky tang)) xa hoi. hieu van cam duc ban thanh ((van cau) OR (van hau)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky lang) OR (ky tang)) xa hoi. hieu van cam duc ban thanh ((van cau) or (van hau)) triet~".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky lang) OR (ky tang)) xa hoi. hieu van cam duc ban thanh ((van cau) or (van hau)) triet*.