Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
doc sach » hoc sach, toc sach, nuoc sach
cac khoi » cac thoi, cac khoan, cach thoi
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
va hanh » va thanh, va danh, ban hanh
y nang » ky nang, ly nang, v nang
va cam » va cham, va cac, va cao
vi cua » vai cua, di cua

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