Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thuc day » thuc dan, thuc vat
hanh di » hanh vi, hanh de, hang di
thuc va » thuc vat, thuc dan
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
mang xa » lang xa, mang may, dang xay
sach v » sach va, sach y, sach 2
di cua » dai cua, doi cua, de cua
ve cac » va cac, vien cac

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 v ((mang xa) OR (nang x)) hoi. hieu ve cac ((thuc va) OR (thuc day)) hanh di cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v ((mang xa) or (nang x)) hoi. hieu ve cac ((thuc va) OR (thuc day)) hanh di cua viet~".
• Adding a wildcard symbol may retrieve word variants: su sach v ((mang xa) or (nang x)) hoi. hieu ve cac ((thuc va) OR (thuc day)) hanh di cua viet*.