Perhaps you should try some spelling variations:
hieu hien » bieu hien, dieu hien, chieu chien
dai truc » dai thuc, doan truc, dai trung
so sanh » do sanh
bo sach » co sach, hoc sach
ly vang » ly hang, ly van, ly quang
vang ma » tang ma, nang ma, sang ma
truc va » thuc va, thuc vat, trung va
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
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 sanh) OR (bo sach)) ly vang ma hoa. hieu hien dai truc va danh vi cua vat~.
• Adding a wildcard symbol may retrieve word variants: ((so sanh) or (bo sach)) ly vang ma hoa. hieu hien dai truc va danh vi cua vat*.