Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
nam thuc » nam thuoc, am thuc, nam thu
hieu van » thien van, lieu va, hieu ve
thuc dan » thuc hanh, hoc dan, thuc vat
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
tu sach » thu sach, su sach, te sach
sach lo » sach dao, sach doi, sach hoi
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
lo nang » ho nang, ly nang, loai nang
ma hoi » mai hoi, xa hoi, ma hoa

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. ((hieu van) OR (hieu va)) nam thuc dan ((hanh di) OR (hanh de)) cua viet~.
• Adding a wildcard symbol may retrieve word variants: tu sach lo nang ma hoi. ((hieu van) or (hieu va)) nam thuc dan ((hanh di) or (hanh de)) cua viet*.