Perhaps you should try some spelling variations:
"sir james nicholson, 1st baronet" » "sir james richardson, 1st baronet", "sir james nicholson, 1st baron", "sir james nicholson, first baronet", "sir james nicholson, colt baronet"
"sir thomas thomson, 1st baronet" » "sir thomas thompson, 1st baronet", "sir thomas thomas, 1st baronet", "sir thomas townson, 1st baronet", "sir thomas thomson, 1st baron", "sir thomas thomson, first baronet", "sir thomas thomson, colt baronet"
"sir thomas dickson, 1st baronet" » "sir thomas jackson, 1st baronet", "sir thomas dixon, 1st baronet", "sir thomas dobson, 1st baronet", "sir thomas dickson, 1st baron", "sir thomas dickson, first baronet", "sir thomas dickson, colt baronet"
"sir thomas dickson, 1st baroness" » "sir thomas jackson, 1st baroness", "sir thomas dixon, 1st baroness", "sir thomas dobson, 1st baroness", "sir thomas dickson, 1st baron", "sir thomas dickson, _ baroness"
"sir thomas denison, 1st baronet" » "sir thomas davidson, 1st baronet", "sir thomas denman, 1st baronet", "sir thomas deacon, 1st baronet", "sir thomas denison, 1st baron", "sir thomas denison, first baronet", "sir thomas denison, colt baronet"
"sir thomas dawson, 1st baronet" » "sir thomas dawson, 1st baron", "sir thomas dawson, first baronet", "sir thomas dawson, colt baronet"

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 thomson, 1st baronet") OR ("sir james nicholson, 1st baronet"))) OR ((((((("sir thomas dickson, 1st baronet") OR ("sir thomas dawson, 1st baronet"))) OR ("sir thomas denison, 1st baronet"))) OR ("sir thomas dickson, 1st baroness")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"sir thomas thomson, 1st baronet\") or (\"sir james nicholson, 1st baronet\"))) or (((((((\"sir thomas dickson, 1st baronet\") OR (\"sir thomas dawson, 1st baronet\"))) or (\"sir thomas denison, 1st baronet\"))) or (\"sir thomas dickson, 1st baroness\"))))".
• Removing quotes may allow a broader search: (((( sir thomas thomson, 1st baronet ) or ( sir james nicholson, 1st baronet ))) or ((((((( sir thomas dickson, 1st baronet ) OR ( sir thomas dawson, 1st baronet ))) or ( sir thomas denison, 1st baronet ))) or ( sir thomas dickson, 1st baroness )))).
• Adding a wildcard symbol may retrieve word variants: (((("sir thomas thomson, 1st baronet") or ("sir james nicholson, 1st baronet"))) or ((((((("sir thomas dickson, 1st baronet") OR ("sir thomas dawson, 1st baronet"))) or ("sir thomas denison, 1st baronet"))) or ("sir thomas dickson, 1st baroness"))))*.