Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, hieu ve
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
y nang » ky nang, ly nang, v nang
ben bo » ban bo
vi cua » vai cua, di cua
x hoi » xa hoi, o hoi, x ho

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 x hoi. ((hieu van) OR (lieu va)) ((ben bo) OR (can bo)) van hanh vi cua triet~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang x hoi. ((hieu van) or (lieu va)) ((ben bo) or (can bo)) van hanh vi cua triet*.