Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
nam thuc » nam thuoc, am thuc, nam thu
hanh de » hanh ve, hanh kem
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
sach lo » sach dao, sach doi, sach hoi
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
lo nang » ho nang, ly nang, loai nang
ca viet » va viet, co viet, hoa viet
ma hoi » xa hoi, ma hoa, me hoi
de ca » de cua, de cai, de 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: tu sach lo nang ((ma hoi) OR (mai hoi)). ((hieu van) OR (hieu va)) nam thuc va hanh de ca viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo nang ((ma hoi) OR (mai hoi)). ((hieu van) or (hieu va)) nam thuc va hanh de ca viet~".
• Adding a wildcard symbol may retrieve word variants: tu sach lo nang ((ma hoi) OR (mai hoi)). ((hieu van) or (hieu va)) nam thuc va hanh de ca viet*.