Perhaps you should try some spelling variations:
lovas robertson » thomas robertson, ross robertson, davies robertson
thomas gresham » thomas pelham, thomas belsham
ivan robertson » ian robertson, ivan roberts, susan robertson
thomas graham » thomas pelham, thomas gray, thomas graeme

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: ((thomas graham) OR (thomas gresham)) robertson, ((lovas robertson) OR (ivan robertson)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thomas graham) or (thomas gresham)) robertson, ((lovas robertson) OR (ivan robertson))".
• Adding a wildcard symbol may retrieve word variants: ((thomas graham) or (thomas gresham)) robertson, ((lovas robertson) OR (ivan robertson))*.