Perhaps you should try some spelling variations:
brian duncan » ian duncan, bruce duncan
duncan smith » duncan sarah, duncan scott
jon duncan » john duncan, j duncan, ian duncan
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: (( jon duncan smith ) OR ( brian duncan sir )).
• Adding a wildcard symbol may retrieve word variants: (( jon duncan smith ) or ( brian duncan sir ))*.