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