Perhaps you should try some spelling variations:
duncan sarah » duncan adam, duncan gray, duncan shaw
john duncan » john dunton, john dunning
fenn smith » fenton smith, lynn smith, ann smith
john fenn » john fell, john fane

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: (( john duncan sarah ) OR ( john fenn smith )).
• Adding a wildcard symbol may retrieve word variants: (( john duncan sarah ) or ( john fenn smith ))*.