Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
ve cam » ve cham, ve cac, va cam
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: tu sac ky nang o hoi. hieu ve cam xuc van hanh vi ((cua tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang o hoi. hieu ve cam xuc van hanh vi ((cua tre) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o hoi. hieu ve cam xuc van hanh vi ((cua tre) or (cau tren))*.