Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » tu sach, thuat sach, thuoc sach
hanh via » hanh vi, hanh va, anh va
hieu va » lieu va
duc van » duc tan, duc manh, duc phan
via cua » gia cua, gian cua, giau cua
y nang » ky nang, ly nang, v nang
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: thu sach y nang x hoi. ((hieu va) OR (hieu qua)) cao ((duc van) OR (duc va)) hanh via cua triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang x hoi. ((hieu va) OR (hieu qua)) cao ((duc van) or (duc va)) hanh via cua triet~".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang x hoi. ((hieu va) OR (hieu qua)) cao ((duc van) or (duc va)) hanh via cua triet*.