Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
nam thuc » nam thuoc, am thuc, nam thu
cua viet » ca viet, hoa viet, cua dieu
tu sach » thu sach, su sach, te sach
sach lo » sach dao, sach doi, sach hoi
lo nang » ho nang, ly nang, loai nang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
hanh de » hanh ve, hanh kem

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 xa hoi. ((hieu van) OR (hieu va)) nam thuc va hanh de ((cua viet) OR (cua vat))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach lo nang xa hoi. ((hieu van) or (hieu va)) nam thuc va hanh de ((cua viet) OR (cua vat))~".
• Adding a wildcard symbol may retrieve word variants: tu sach lo nang xa hoi. ((hieu van) or (hieu va)) nam thuc va hanh de ((cua viet) OR (cua vat))*.