Perhaps you should try some spelling variations:
duncan scotus » duns scotus
duncan smith » duncan sarah, duncan scott
fenton smith » exton smith, brunton smith, preston smith
john fenton » john dunton, john fenn, john hinton
duncan sir » duncan i, duncan sarah

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: (( john ((((duncan smith) OR (duncan sir))) OR (duncan scotus)) ) OR ( john fenton smith )).
• Adding a wildcard symbol may retrieve word variants: (( john ((((duncan smith) or (duncan sir))) or (duncan scotus)) ) or ( john fenton smith ))*.