Perhaps you should try some spelling variations:
"robert harley, 1st early of oxford and early mortimer" » "robert harley, 1st early of oxford and earl mortimer", "robert harley, 1st early of oxford and earl mortimer's", "robert harley, 1st early of oxford and early maritime", "robert harley, west early of oxford and early mortimer", "robert harley, most early of oxford and early mortimer", "robert harley, east early of oxford and early mortimer"
"robert harley, 1st earl of oxford and early mortimer" » "robert harley, 1st earl of oxford and earl mortimer", "robert harley, 1st earl of oxford and earl mortimer's", "robert harley, 1st earl of oxford and early maritime"

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: "((\"robert harley, 1st early of oxford and early mortimer\") OR (\"robert harley, 1st earl of oxford and early mortimer\"))".
• Removing quotes may allow a broader search: (( robert harley, 1st early of oxford and early mortimer ) OR ( robert harley, 1st earl of oxford and early mortimer )).
• Adding a wildcard symbol may retrieve word variants: (("robert harley, 1st early of oxford and early mortimer") OR ("robert harley, 1st earl of oxford and early mortimer"))*.