Perhaps you should try some spelling variations:
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
cam luc » cam xuc, cau luc
su sach » so sach, vu sach
hieu ve » hieu van
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
xua va » xuat va, sua va
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: su sach y nang x hoi. ((hieu ve) OR (hieu va)) cam luc va hanh ((xua va) OR (vua va)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y nang x hoi. ((hieu ve) or (hieu va)) cam luc va hanh ((xua va) OR (vua va)) triet~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. ((hieu ve) or (hieu va)) cam luc va hanh ((xua va) OR (vua va)) triet*.