Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cham duc » pham duc, cham soc, pham duy
su triet » su viet, ve triet
thanh vi » hanh vi, thanh va, thanh ve
hieu van » hieu va, thien van, lieu va
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
tang ma » mang may, tang van
hieu ve » hieu va
su tien » su kien, su hien, tu tieng
y tang » ky tang, 6 tang, 7 tang
ma hoi » mai hoi, xa hoi, ma hoa

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: tu sach y tang ma hoi. ((hieu ve) OR (hieu van)) cham duc van thanh vi ((su triet) OR (su tien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y tang ma hoi. ((hieu ve) OR (hieu van)) cham duc van thanh vi ((su triet) or (su tien))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y tang ma hoi. ((hieu ve) OR (hieu van)) cham duc van thanh vi ((su triet) or (su tien))*.