Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
cua viet » ca viet, hoa viet, cua vat
dai truc » dai thuc, doan truc, dai trung
danh vi » hanh vi, dinh vi, danh di
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
so sach » so sanh, co sach, hoc sach
ly nang » ky nang, ly hang, ly vang
bo sach » co sach, hoc sach
ma hoi » mai hoi, xa hoi, me hoi
vi cua » vai cua, di cua

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: ((so sach) OR (bo sach)) ly nang ((ma hoi) OR (ma hoa)). hieu hien dai truc va danh vi cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) or (bo sach)) ly nang ((ma hoi) OR (ma hoa)). hieu hien dai truc va danh vi cua viet~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (bo sach)) ly nang ((ma hoi) OR (ma hoa)). hieu hien dai truc va danh vi cua viet*.