Perhaps you should try some spelling variations:
"inter operational resilience" » "inter operational excellence", "inter operational efficiency", "inter operational experience", "filter operational resilience", "inter operation resilience", "under operational resilience"
"inter regional resilience" » "inter regional science"
"elter national conference" » "elter international conference", "alter national conference", "center national conference", "better national conference"

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: (((("inter regional resilience") OR ("inter operational resilience"))) OR ("elter national conference"))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"inter regional resilience\") OR (\"inter operational resilience\"))) or (\"elter national conference\"))*".
• Removing quotes may allow a broader search: (((( inter regional resilience ) OR ( inter operational resilience ))) or ( elter national conference ))*.