Perhaps you should try some spelling variations:
henry griffiths » henry griffin, hannah griffiths
owen griffiths » green griffiths, roger griffiths, de griffiths
mary griffiths » mark griffiths, mrs griffiths, a griffiths

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: ((owen griffiths) OR (((henry griffiths) OR (mary griffiths)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((owen griffiths) or (((henry griffiths) OR (mary griffiths))))".
• Adding a wildcard symbol may retrieve word variants: ((owen griffiths) or (((henry griffiths) OR (mary griffiths))))*.