Perhaps you should try some spelling variations:
regional resilience » regional science, operational resilience
regional conference » regional convergence, global conference
national conference » international conference
regional reference » regional convergence
inter » unter

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( elter ((regional reference) OR (regional resilience)) ) OR ( inter ((((regional conference) OR (regional differences))) OR (national conference)) ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( elter ((regional reference) OR (regional resilience)) ) or ( inter ((((regional conference) or (regional differences))) or (national conference)) ))*".