Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
cua triet » su triet, va triet
cua viet » ca viet, hoa viet, cua vat
hieu va » lieu va, hieu qua
cao duc » dao duc, cao suc, giao duc
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao
va anh » van anh, va danh, va banh
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuoc sach y nang x hoi. hieu va cao duc ((va anh) or (va hanh)) va ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang x hoi. hieu va cao duc ((va anh) OR (va hanh)) va ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang x hoi. hieu va cao duc ((va anh) or (va hanh)) va ((cua triet) or (cua viet))*.