Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cuu tre » cua tre, cau tren, cau treo
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
ve cac » vien cac
va dao » ca dao
dao vi » dao voi, dao ve, dao va
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 cac) or (va cac)) tu va dao vi ((cuu tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang o hoi. hieu ((ve cac) OR (va cac)) tu va dao vi ((cuu tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o hoi. hieu ((ve cac) or (va cac)) tu va dao vi ((cuu tre) or (cua triet))*.