Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
va triet » va thiet, va trien, ve triet
qua cham » qua hai, qua cac, va cham
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
so sach » bo sach, co sach, hoc sach
so sanh » do sanh
ma hoi » mai hoi, xa hoi, me hoi
y nang » ky nang, ly nang, v nang
vi va » vi van, vai va, vu va

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) OR (so sanh)) y nang ((ma hoi) OR (ma hoa)). hieu qua cham truc va hanh vi va triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((so sach) OR (so sanh)) y nang ((ma hoi) or (ma hoa)). hieu qua cham truc va hanh vi va triet~".
• Adding a wildcard symbol may retrieve word variants: ((so sach) OR (so sanh)) y nang ((ma hoi) or (ma hoa)). hieu qua cham truc va hanh vi va triet*.