Perhaps you should try some spelling variations:
"hugh griffiths, mark griffiths" » "hughes griffith, mark griffiths", "nach griffiths, mark griffiths", "hannah griffiths, mark griffiths", "hugh griffiths, mrs griffiths", "hugh griffiths, a griffiths"
"hugh griffiths, mary griffiths" » "hughes griffith, 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", "_ griffiths, mark griffiths", "d griffiths, mark griffiths", "a 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, mark griffiths") OR ("hugh griffiths, mary griffiths"))) OR ("g griffiths, mark griffiths")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"hugh griffiths, mark griffiths\") OR (\"hugh griffiths, mary griffiths\"))) or (\"g griffiths, mark griffiths\"))".
• Removing quotes may allow a broader search: (((( hugh griffiths, mark griffiths ) OR ( hugh griffiths, mary griffiths ))) or ( g griffiths, mark griffiths )).
• Adding a wildcard symbol may retrieve word variants: (((("hugh griffiths, mark griffiths") OR ("hugh griffiths, mary griffiths"))) or ("g griffiths, mark griffiths"))*.