Perhaps you should try some spelling variations:
"sir thomas nicholson, 1st baronet" » "sir thomas richardson, 1st baronet", "sir thomas wilson, 1st baronet", "sir thomas thomson, 1st baronet", "sir thomas nicholson, 1st baron", "sir thomas nicholson, colt baronet", "sir thomas nicholson, luss baronet"
"sir james nicholson, 1st baronet" » "sir james richardson, 1st baronet", "sir james nicholson, 1st baron", "sir james nicholson, colt baronet", "sir james nicholson, luss baronet"
"sir thomas dickson, first baronet" » "sir thomas jackson, first baronet", "sir thomas dawson, first baronet", "sir thomas denison, first baronet", "sir thomas dickson, first barrier", "sir thomas dickson, first tyrone"
"sir thomas dickson, 1st baroness" » "sir thomas jackson, 1st baroness", "sir thomas dawson, 1st baroness", "sir thomas denison, 1st baroness", "sir thomas dickson, 1st baron", "sir thomas dickson, _ baroness"

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((("sir thomas nicholson, 1st baronet") OR ("sir james nicholson, 1st baronet"))) OR ((("sir thomas dickson, first baronet") OR ("sir thomas dickson, 1st baroness")))).
• Removing quotes may allow a broader search: (((( sir thomas nicholson, 1st baronet ) or ( sir james nicholson, 1st baronet ))) or ((( sir thomas dickson, first baronet ) or ( sir thomas dickson, 1st baroness )))).
• Adding a wildcard symbol may retrieve word variants: (((("sir thomas nicholson, 1st baronet") or ("sir james nicholson, 1st baronet"))) or ((("sir thomas dickson, first baronet") or ("sir thomas dickson, 1st baroness"))))*.