Perhaps you should try some spelling variations:
"inter regional conference" » "inter regional convergence", "inter regional differences", "inter global conference"
"inter national conference" » "inter international conference", "der national conference"
"elter regional reference" » "elter regional differences", "elter regional resilience", "elter regional convergence", "better regional reference", "center regional reference", "after regional reference"

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: "((\"elter regional reference\") OR (((\"inter regional conference\") OR (\"inter national conference\"))))".
• Removing quotes may allow a broader search: (( elter regional reference ) OR ((( inter regional conference ) OR ( inter national conference )))).
• Adding a wildcard symbol may retrieve word variants: (("elter regional reference") OR ((("inter regional conference") OR ("inter national conference"))))*.