Perhaps you should try some spelling variations:
brian duncan » ian duncan, bruce duncan
duncan smith » duncan sarah, duncan sir, duncan scott
a duncan » ra duncan, j duncan, m duncan
_ duncan » _ dunciad

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: (( brian duncan smith ) OR ( ((((a duncan) OR (_ duncan))) OR (r((a duncan) OR (_ duncan)))) smith )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( brian duncan smith ) or ( ((((a duncan) OR (_ duncan))) or (r((a duncan) OR (_ duncan)))) smith ))".
• Adding a wildcard symbol may retrieve word variants: (( brian duncan smith ) or ( ((((a duncan) OR (_ duncan))) or (r((a duncan) OR (_ duncan)))) smith ))*.