Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
thu sach » thuat sach, thuoc sach, thu hoach
nam thuc » nam thuoc, am thuc, nam thu
danh de » hanh de, dan de, dang de
va danh » va dinh, va dan, va hanh
thuc va » thuc vat, thuc dan, thuc day
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
lo nang » ho nang, ly nang, loai nang
hieu ve » hieu va, hieu van
ma hoi » mai hoi, xa hoi, ma hoa
de cua » le cua, te cua, dieu 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) OR (thu sach)) lo nang ma hoi. ((hieu ve) OR (hieu qua)) nam thuc va danh de cua viet~.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) lo nang ma hoi. ((hieu ve) or (hieu qua)) nam thuc va danh de cua viet*.