Perhaps you should try some spelling variations:
"sir thomas nicholson, 1st baronet" » "sir thomas richardson, 1st baronet", "sir thomas wilson, 1st baronet", "sir thomas dickson, 1st baronet", "sir thomas nicholson, 1st baron", "sir thomas nicholson, first baronet", "sir thomas nicholson, colt baronet"
"sir thomas nicholson, 1st baroness" » "sir thomas richardson, 1st baroness", "sir thomas wilson, 1st baroness", "sir thomas dickson, 1st baroness", "sir thomas nicholson, 1st baron", "sir thomas nicholson, _ baroness"

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: "((\"sir thomas nicholson, 1st baronet\") OR (\"sir thomas nicholson, 1st baroness\"))".
• Removing quotes may allow a broader search: (( sir thomas nicholson, 1st baronet ) OR ( sir thomas nicholson, 1st baroness )).
• Adding a wildcard symbol may retrieve word variants: (("sir thomas nicholson, 1st baronet") OR ("sir thomas nicholson, 1st baroness"))*.