Perhaps you should try some spelling variations:
"hughes griffith, mark griffiths" » "hughes griffith, mary griffiths", "hughes griffith, mrs griffiths"
"hugh griffiths, a griffiths" » "g griffiths, a griffiths", "nach griffiths, a griffiths", "hannah griffiths, a griffiths", "hugh griffiths, a griffith", "hugh griffiths, _ griffiths", "hugh griffiths, d griffiths"

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"hughes griffith, mark griffiths\") OR (\"hugh griffiths, a griffiths\"))*".
• Removing quotes may allow a broader search: (( hughes griffith, mark griffiths ) OR ( hugh griffiths, a griffiths ))*.