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