Perhaps you should try some spelling variations:
"sir thomas nicholson, colt baronet" » "sir thomas richardson, colt baronet", "sir thomas wilson, colt baronet", "sir james nicholson, colt baronet", "sir thomas nicholson, holte baronet", "sir thomas nicholson, cox baronet", "sir thomas nicholson, cobb baronet"
"sir thomas dickson, 1st baronet" » "sir thomas jackson, 1st baronet", "sir thomas dawson, 1st baronet", "sir thomas denison, 1st baronet", "sir thomas dickson, first baronet", "sir thomas dickson, luss baronet"
"sir thomas dickson, 1st baron" » "sir thomas jackson, 1st baron", "sir thomas dawson, 1st baron", "sir thomas denison, 1st baron"
"sir thomas dickson, 1st baroness" » "sir thomas jackson, 1st baroness", "sir thomas dawson, 1st baroness", "sir thomas denison, 1st baroness", "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, colt baronet") OR ((((("sir thomas dickson, 1st baronet") OR ("sir thomas dickson, 1st baron"))) OR ("sir thomas dickson, 1st baroness")))).
• Removing quotes may allow a broader search: (( sir thomas nicholson, colt baronet ) or ((((( sir thomas dickson, 1st baronet ) or ( sir thomas dickson, 1st baron ))) or ( sir thomas dickson, 1st baroness )))).
• Adding a wildcard symbol may retrieve word variants: (("sir thomas nicholson, colt baronet") or ((((("sir thomas dickson, 1st baronet") or ("sir thomas dickson, 1st baron"))) or ("sir thomas dickson, 1st baroness"))))*.