Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
pham cuc » pham chuc, pham duc, pham cua
ban hanh » ban hang
hanh vai » hanh vi, hanh va, hanh tai
cuc ban » cua ban, cac ban, cuu ban
cua tre » cua te, cuu tre, dua tren
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: tu cac ky nang o hoi. hieu van pham cuc ban hanh vai ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang o hoi. hieu van pham cuc ban hanh vai ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang o hoi. hieu van pham cuc ban hanh vai ((cua tre) or (cua triet))*.