Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
hieu va » lieu va, hieu qua
lam loc » lam duoc, lam ngoc
va hanh » van hanh, va thanh, va danh
suat va » xuat va
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
va lam » van lam, va lap
loc va » hoc va, luc va
sua va » vua va, xua va
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach y nang o hoi. hieu va lam loc va hanh ((sua va) or (suat va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang o hoi. hieu va lam loc va hanh ((sua va) OR (suat va)) triet.
• Adding a wildcard symbol may retrieve word variants: so sach y nang o hoi. hieu va lam loc va hanh ((sua va) or (suat va)) triet*.