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

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((\\"war ((regional reference) OR (regional convergence))\\") or (\\"war regional conference\\"))\"".
• Removing quotes may allow a broader search: (( war ((regional reference) OR (regional convergence)) ) or ( war regional conference )).