Perhaps you should try some spelling variations:
"sir thomas nicholson, 1st baronet" » "sir thomas richardson, 1st baronet", "sir thomas wilson, 1st baronet", "sir james nicholson, 1st baronet", "sir thomas nicholson, 1st baron", "sir thomas nicholson, first baronet", "sir thomas nicholson, luss baronet"
"sir thomas dickson, colt baronet" » "sir thomas jackson, colt baronet", "sir thomas denison, colt baronet", "sir thomas dixon, colt baronet", "sir thomas dickson, holte baronet", "sir thomas dickson, cox baronet", "sir thomas dickson, cobb baronet"
"sir thomas dickson, 1st baroness" » "sir thomas jackson, 1st baroness", "sir thomas denison, 1st baroness", "sir thomas dixon, 1st baroness", "sir thomas dickson, 1st baron", "sir thomas dickson, _ baroness"
"sir thomas dawson, 1st baroness" » "sir thomas dawson, 1st baron", "sir thomas dawson, _ 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 thomas dickson, colt baronet") OR ((("sir thomas dickson, 1st baroness") OR ("sir thomas dawson, 1st baroness")))))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"sir thomas nicholson, 1st baronet\") or (((\"sir thomas dickson, colt baronet\") or (((\"sir thomas dickson, 1st baroness\") OR (\"sir thomas dawson, 1st baroness\"))))))".
• Removing quotes may allow a broader search: (( sir thomas nicholson, 1st baronet ) or ((( sir thomas dickson, colt baronet ) or ((( sir thomas dickson, 1st baroness ) OR ( sir thomas dawson, 1st baroness )))))).
• Adding a wildcard symbol may retrieve word variants: (("sir thomas nicholson, 1st baronet") or ((("sir thomas dickson, colt baronet") or ((("sir thomas dickson, 1st baroness") OR ("sir thomas dawson, 1st baroness"))))))*.