Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban hanh » ban hang
ba trung » tai trung, nam trung, do trung
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
so sach » so sanh, bo sach, co sach
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, ma hoa, me hoi
vi cua » vai cua, di cua
va ba » va bai, va bao, va ban

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: so sach y nang ((ma hoi) OR (xa hoi)). hieu va ba trung ((ban hanh) OR (va danh)) vi cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y nang ((ma hoi) OR (xa hoi)). hieu va ba trung ((ban hanh) or (va danh)) vi cua triet~".
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((ma hoi) OR (xa hoi)). hieu va ba trung ((ban hanh) or (va danh)) vi cua triet*.