Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cac tuc » cac toc, cac tu, cac tac
tuc van » thuc van, truc van, tuc va
van cac » van hac, van cau, van bac
nang ro » nang co, nang ho, nang ra
sai ky » sac ky
nang o » nang co, nang ho, nang x
su sai » su tai, su hai, su dai

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) OR (nang ro)) 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) OR (nang ro)) hoi. hieu van cac tuc van hanh vi ((cua triet) OR (su triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sai ky ((nang o) OR (nang ro)) hoi. hieu van cac tuc van hanh vi ((cua triet) or (su triet))*".