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