Perhaps you should try some spelling variations:
regional convergence » global convergence
regional conference » national conference, regional differences, global conference
elter regional » better regional, center regional, after 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 convergence ) OR ( inter regional conference )).
• Adding a wildcard symbol may retrieve word variants: (( elter regional convergence ) or ( inter regional conference ))*.