Perhaps you should try some spelling variations:
"elgar operational resilience" » "elgar operational excellence", "elgar operational efficiency", "elgar operational experience", "pillar operational resilience", "year operational resilience", "gpr operational resilience"
"elgar regional convergence" » "elgar global convergence", "elter regional convergence", "algarve regional convergence", "war regional convergence"
"elgar regional conference" » "elgar national conference", "elgar regional differences", "elgar global conference", "elter regional conference", "algarve regional conference", "war regional conference"
"elgar regional resilience" » "elgar regional science", "elter regional resilience", "algarve regional resilience", "war regional resilience"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("elgar regional conference") OR ("elgar regional convergence"))) OR ((("elgar regional resilience") OR ("elgar operational resilience")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"elgar regional conference\") OR (\"elgar regional convergence\"))) or (((\"elgar regional resilience\") or (\"elgar operational resilience\"))))".
• Removing quotes may allow a broader search: (((( elgar regional conference ) OR ( elgar regional convergence ))) or ((( elgar regional resilience ) or ( elgar operational resilience )))).
• Adding a wildcard symbol may retrieve word variants: (((("elgar regional conference") OR ("elgar regional convergence"))) or ((("elgar regional resilience") or ("elgar operational resilience"))))*.