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, m 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 (_ 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 (_ duncan)) smith ))".
• Adding a wildcard symbol may retrieve word variants: (( ian ((duncan smith) OR (duncan sarah)) ) or ( ((a duncan) or (_ duncan)) smith ))*.