Perhaps you should try some spelling variations:
su triet » su viet, ve triet
bo sach » co sach, hoc sach
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
su tien » su kien, su hien, tu tieng
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, luc va

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

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