Perhaps you should try some spelling variations:
duncan scotus » duns scotus
duncan smith » duncan sarah, duncan sir, duncan scott
john duncan » john dunton, john dunning
jon duncan » j duncan, ian duncan, colin duncan

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