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