Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
tang van » dang van, hoang van, trong van
vat hanh » vat thanh, van hanh, va hanh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » thien van, lieu va, hieu ve
sach doi » sach hoi, sach moi, sach dao
van hoi » van hoa, van hoc, van hoe
sach lo » sach dao, sach hoi, sach moi
hieu va » lieu va, hieu qua
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de 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: tu ((sach lo) OR (sach doi)) tang van hoi. ((hieu van) OR (hieu va)) nam thuc vat hanh di cua viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach lo) OR (sach doi)) tang van hoi. ((hieu van) or (hieu va)) nam thuc vat hanh di cua viet~".
• Adding a wildcard symbol may retrieve word variants: tu ((sach lo) OR (sach doi)) tang van hoi. ((hieu van) or (hieu va)) nam thuc vat hanh di cua viet*.