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