Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
ban thanh » ban hanh, ban hang
duoc lam » duoc pham, duoc ly, duoc li
thanh ve » hanh ve, thanh va, thanh vien
hieu ban » hieu van, dieu ban, lieu ban
cua tre » cua te, cuu tre, dua tren
so sach » so sanh, bo sach, co sach
tu nang » tru nang, tu nong, tu nano
sach tu » sach thu, cach tu, sach ty
nang o » nang co, nang ho, nang ro
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 tu nang o hoi. hieu ban thanh ((duoc ma) OR (duoc lam)) thanh ve ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tu nang o hoi. hieu ban thanh ((duoc ma) OR (duoc lam)) thanh ve ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tu nang o hoi. hieu ban thanh ((duoc ma) OR (duoc lam)) thanh ve ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: so sach tu nang o hoi. hieu ban thanh ((duoc ma) OR (duoc lam)) thanh ve ((cua tre) or (cua triet))*.