Perhaps you should try some spelling variations:
"bennison, philip / 1710 or 11-1738" » "tennison, philip / 1710 or 11-1738", "denison, philip / 1710 or 11-1738", "tenison, philip / 1710 or 11-1738"
"dennison, philip / 1710 or 11-1738" » "denison, philip / 1710 or 11-1738", "dennis, philip / 1710 or 11-1738", "tenison, philip / 1710 or 11-1738"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"bennison, philip / 1710 or 11-1738\") OR (\"dennison, philip / 1710 or 11-1738\"))".
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