Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su triet » su viet, ve triet
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
van hoi » van hoc, van hoe, van loi
nam xuc » cam xuc, nam xua, nam thuc
va hanh » van hanh, va thanh, va danh
su tien » su kien, su hien, tu tieng
xuc va » duc va, tuc va, luc va
kem » kiem

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky tang ((van hoi) or (van hoa)). hieu van nam xuc va hanh kem ((su triet) OR (su tien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang ((van hoi) OR (van hoa)). hieu van nam xuc va hanh kem ((su triet) OR (su tien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky tang ((van hoi) or (van hoa)). hieu van nam xuc va hanh kem ((su triet) OR (su tien))".
• Adding a wildcard symbol may retrieve word variants: su sach ky tang ((van hoi) or (van hoa)). hieu van nam xuc va hanh kem ((su triet) OR (su tien))*.