Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
su sach » so sach, vu sach
ty tang » tay tang, ty xang, ky tang
ty hang » ly hang, ty xang, thi hang
viec da » viec dat, vien da, viec va
da thuc » dan thuc, dai thuc, dam thuc
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
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: su sach ((ty tang) OR (ty hang)) ma hoa. hieu viec da thuc va hanh vi cua vat~.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty tang) or (ty hang)) ma hoa. hieu viec da thuc va hanh vi cua vat*.