Perhaps you should try some spelling variations:
regional conference » regional convergence, national conference, regional differences
better regional » center regional, between regional, matters regional
elter regional » center regional, after regional, einer regional
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) OR (better regional)) reference ) OR ( inter regional conference )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((elter regional) OR (better regional)) reference ) or ( inter regional conference ))".
• Adding a wildcard symbol may retrieve word variants: (( ((elter regional) OR (better regional)) reference ) or ( inter regional conference ))*.