Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
danh sai » dung sai, danh bat, danh dau
lam thuc » lam thuoc, am thuc, nam thuc
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
co loi » co hoi
va lam » van lam, va lap
y nang » ky nang, ly nang, v nang

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 y nang ((co hoc) OR (co loi)). hieu va lam thuc va danh sai ((cua triet) OR (va triet))~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((co hoc) or (co loi)). hieu va lam thuc va danh sai ((cua triet) or (va triet))*.