Perhaps you should try some spelling variations:
brian duncan » bruce duncan
brjon duncan » jon duncan, brown duncan, ron duncan
ian duncan » a duncan, jon duncan, innes duncan
duncan sir » duncan i, duncan sarah

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