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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang o hoi. hieu ket cau luc va hanh vi ((((cua tre) OR (dua tren))) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang o hoi. hieu ket cau luc va hanh vi ((((cua tre) OR (dua tren))) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang o hoi. hieu ket cau luc va hanh vi ((((cua tre) OR (dua tren))) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang o hoi. hieu ket cau luc va hanh vi ((((cua tre) OR (dua tren))) or (cuu tre))*.