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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cases series: naval history and policy\") OR (\"care services: naval history and policy\"))~".
• Removing quotes may allow a broader search: (( cases series: naval history and policy ) OR ( care services: naval history and policy ))~.
• Adding a wildcard symbol may retrieve word variants: (("cases series: naval history and policy") OR ("care services: naval history and policy"))*.