Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cham duc » pham duc, cham soc, pham duy
cua tre » cua te, cuu tre, cua triet
va hanh » van hanh, va thanh, va danh
te sach » toc sach
hieu vu » hieu ve, hieu su, dieu vu
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
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: te sach y nang o hoi. ((hieu vu) or (hieu va)) cham duc va hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang o hoi. ((hieu vu) OR (hieu va)) cham duc va hanh vi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: te sach y nang o hoi. ((hieu vu) or (hieu va)) cham duc va hanh vi ((cua tre) or (cau tren))*.