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