Perhaps you should try some spelling variations:
"hugh griffiths, mary griffiths" » "nach griffiths, mary griffiths", "hannah griffiths, mary griffiths", "hugh griffiths, mrs griffiths", "hugh griffiths, a griffiths"
"g griffiths, mark griffiths" » "g griffiths, mrs griffiths", "g griffiths, a griffiths", "d griffiths, mark griffiths", "a griffiths, mark griffiths", "e griffiths, mark 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: (((("hugh griffiths, mary griffiths") OR ("hughes griffith, _ griffiths"))) OR ("g griffiths, mark griffiths")).
• Removing quotes may allow a broader search: (((( hugh griffiths, mary griffiths ) or ( hughes griffith, _ griffiths ))) or ( g griffiths, mark griffiths )).
• Adding a wildcard symbol may retrieve word variants: (((("hugh griffiths, mary griffiths") or ("hughes griffith, _ griffiths"))) or ("g griffiths, mark griffiths"))*.