Perhaps you should try some spelling variations:
duncan smith » duncan sarah, duncan sir, duncan scott
jon duncan » john duncan, ian duncan, colin duncan
ra duncan » _ duncan, mr duncan, m duncan
j duncan » _ duncan, mr 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: (( ((ra duncan) OR (j duncan)) sir ) OR ( jon duncan smith ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((ra duncan) OR (j duncan)) sir ) or ( jon duncan smith ))*".