Perhaps you should try some spelling variations:
"mary griffiths" » "mark griffiths", "mrs griffiths"
"a griffiths" » "_ griffiths", "d griffiths", "e griffiths", "mr griffiths", "mrs griffiths"
"a griffith" » "_ griffith", "mr griffith", "mrs griffith"

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: (("mary griffiths") OR ((("a griffiths") OR ("a griffith")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"mary griffiths\") or (((\"a griffiths\") OR (\"a griffith\"))))".
• Removing quotes may allow a broader search: (( mary griffiths ) or ((( a griffiths ) OR ( a griffith )))).
• Adding a wildcard symbol may retrieve word variants: (("mary griffiths") or ((("a griffiths") OR ("a griffith"))))*.