Perhaps you should try some spelling variations:
van dinh » van minh, van dich, xuan dinh
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
va dinh » va kinh, va tinh, vu dinh
ro hai » co hai, o hai, do hai
so hai » son hai, su hai, so ha
van su » dan su
va am » va lam, va cam

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 ky nang ((ro hai) OR (so hai)). hieu va am thuc ((va dinh) OR (van dinh)) van su triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ro hai) or (so hai)). hieu va am thuc ((va dinh) OR (van dinh)) van su triet~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ro hai) or (so hai)). hieu va am thuc ((va dinh) OR (van dinh)) van su triet*.