Perhaps you should try some spelling variations:
nuoc sach » nguoi sach, hoc sach, cuoc cach
cua triet » cua viet, va triet
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
cac khoi » cac thoi, cac khoan, cach thoi
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
duc van » duc va, duc tan, duc manh
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao

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: nuoc sach y nang ((xa hoi) OR (cac khoi)). hieu va cao duc van hanh vi ((cua triet) OR (su triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc sach y nang ((xa hoi) or (cac khoi)). hieu va cao duc van hanh vi ((cua triet) OR (su triet))~".
• Adding a wildcard symbol may retrieve word variants: nuoc sach y nang ((xa hoi) or (cac khoi)). hieu va cao duc van hanh vi ((cua triet) OR (su triet))*.