Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
van hanh » van thanh, ban hanh, van ban
bach ky » bac ky
qua cao » qua cac, qua ca, qua cai
cao duc » dao duc, cao suc, giao duc
va hanh » va thanh, va danh, ban hanh
van anh » van thanh, tuan anh, van minh
nang o » nang co, nang ho, nang ro
vi cua » vai cua, di cua
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: vu bach ky nang o hoi. hieu qua cao duc ((va hanh) or (((van hanh) or (van anh)))) vi cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu bach ky nang o hoi. hieu qua cao duc ((va hanh) OR (((van hanh) OR (van anh)))) vi cua triet.
• Adding a wildcard symbol may retrieve word variants: vu bach ky nang o hoi. hieu qua cao duc ((va hanh) or (((van hanh) or (van anh)))) vi cua triet*.