Perhaps you should try some spelling variations:
hanh sua » hinh su, hanh va, hanh tu
su sach » so sach, vu sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
loc va » hoc va
luc va » duc va, tuc va
y nang » ky nang, ly nang, v nang
sua va » suat va, vua va, xua va
x hoi » xa hoi, o hoi, x ho
thiet » thieu

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) OR (loc va)) hanh sua va thiet~.
• 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) OR (loc va)) hanh sua va thiet~".
• Adding a wildcard symbol may retrieve word variants: su sach y nang x hoi. ((hieu ve) or (hieu va)) cam ((luc va) OR (loc va)) hanh sua va thiet*.