Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
su triet » su viet, su tien, ve triet
van cac » van hac, van cau, van bac
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
su sai » su tai, su hai, su dai
sai ky » sac ky
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: su sai ky nang o hoi. hieu van cac tuc van hanh vi ((cua triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sai ky nang o hoi. hieu van cac tuc van hanh vi ((cua triet) OR (su triet))*.