Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thanh van » thanh san, thanh toan, thanh phan
su triet » su viet, su tien, ve triet
va triet » va thiet, va trien, ve triet
sach ky » sac ky, sach y, sach ty
te sach » toc sach
hieu va » lieu va
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
du ban » dua ban, duc ban, du bao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky tang xa hoi. ((hieu va) or (hieu qua)) cac du ban thanh van ((va triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang xa hoi. ((hieu va) OR (hieu qua)) cac du ban thanh van ((va triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: te sach ky tang xa hoi. ((hieu va) or (hieu qua)) cac du ban thanh van ((va triet) or (su triet))*.