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