Perhaps you should try some spelling variations:
va triet » va thiet, va trien, cua triet
ve triet » va trien, su triet
ky lang » ky dang, ky tang, tay lang
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
su xac » pu xac, su cac
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su xac ((ky lang) or (ky nang)) xa hoi. hieu ve cac tuc va hanh vi ((va triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su xac ((ky lang) OR (ky nang)) xa hoi. hieu ve cac tuc va hanh vi ((va triet) OR (ve triet)).
• Adding a wildcard symbol may retrieve word variants: su xac ((ky lang) or (ky nang)) xa hoi. hieu ve cac tuc va hanh vi ((va triet) or (ve triet))*.