Perhaps you should try some spelling variations:
duncan smith » duncan sarah, duncan scott
jon duncan » john duncan, j duncan, ian duncan
duncan sir » duncan sarah
duncan i » duncan _, duncan m, duncan c

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: (( ra ((duncan sir) OR (duncan i)) ) OR ( jon duncan smith ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ra ((duncan sir) OR (duncan i)) ) or ( jon duncan smith ))*".