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