Perhaps you should try some spelling variations:
ve triet » va trien, su triet
chat soc » cham soc, chat doc, chat song
va triet » va thiet, va trien, cua triet
van hanh » van thanh, ban hanh, van anh
chat hoc » chat hoa, chat thom, cho hoc
hanh di » hanh vi, hanh de, hang di
nang ma » tang ma, sang ma, nang cao
san ky » sang ky, van ky, dan ky
ma hoi » mai hoi, xa hoi, ma hoa
tu san » thu san, tu ban, tu can

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky nang ma hoi. lieu va ((chat soc) OR (chat hoc)) van hanh di ((va triet) or (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ma hoi. lieu va ((chat soc) OR (chat hoc)) van hanh di ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang ma hoi. lieu va ((chat soc) OR (chat hoc)) van hanh di ((va triet) or (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu san ky nang ma hoi. lieu va ((chat soc) OR (chat hoc)) van hanh di ((va triet) or (ve triet))*.