Perhaps you should try some spelling variations:
jon duncan » john duncan, j duncan, ian duncan
ra duncan » _ duncan, j duncan, m duncan
mr duncan » _ duncan, mr dundas
duncan i » duncan _, duncan m, duncan c

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: (( ((ra duncan) OR (mr duncan)) sir ) OR ( jon duncan i )).
• Adding a wildcard symbol may retrieve word variants: (( ((ra duncan) or (mr duncan)) sir ) or ( jon duncan i ))*.