Perhaps you should try some spelling variations:
hieu ket » hieu kem, thien ket, lien ket
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
cuu tre » cau tren, cau treo
te sach » toc sach
nang o » nang co, nang ho, nang ro
luc va » duc va, tuc va, loc va
te sac » te cac, te san
o hoi » co hoi, o hoc, o hai

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: ((te sac) OR (te sach)) ky nang o hoi. hieu ket cau luc va hanh vi ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te sach)) ky nang o hoi. hieu ket cau luc va hanh vi ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te sach)) ky nang o hoi. hieu ket cau luc va hanh vi ((cua tre) or (cuu tre))*.