Perhaps you should try some spelling variations:
colin duncan » john duncan
duncan sarah » duncan adam, duncan gray, duncan shaw
j duncan » _ duncan, mr duncan
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: (( colin duncan sarah ) OR ( j duncan i )).
• Adding a wildcard symbol may retrieve word variants: (( colin duncan sarah ) or ( j duncan i ))*.