Perhaps you should try some spelling variations:
regional convergence » global convergence
regional conference » national conference, regional differences, global conference
war regional » der regional, toward regional, fur regionale

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: (( war regional convergence ) OR ( war regional conference )).
• Adding a wildcard symbol may retrieve word variants: (( war regional convergence ) or ( war regional conference ))*.