Perhaps you should try some spelling variations:
gwenny griffiths » green griffiths, owen griffiths, morwenna griffiths
henry griffiths » henry griffin, hannah 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: ((gwenny griffiths) OR (((henry griffiths) OR (mary griffiths)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((gwenny griffiths) or (((henry griffiths) OR (mary griffiths))))".
• Adding a wildcard symbol may retrieve word variants: ((gwenny griffiths) or (((henry griffiths) OR (mary griffiths))))*.