Perhaps you should try some spelling variations:
cam truc » cau truc, nam truc, lam truoc
va triet » va thiet, va trien, ve triet
so sach » so sanh, bo sach, co sach
qua cam » qua cham, qua cac, qua ca
truc va » thuc va, thuc vat, trung va
va hanh » van hanh, va thanh, va danh
hanh vu » hanh vi, hanh va, hanh tu
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
vu va » vu van, tu va, su 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 y nang ((ma hoi) OR (ma hoa)). hieu qua cam truc va hanh vu va triet~.
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((ma hoi) or (ma hoa)). hieu qua cam truc va hanh vu va triet*.