Perhaps you should try some spelling variations:
"george biddell keller" » "george liddell keller", "george waddell keller", "george baddelley keller"
"george biddle keller" » "george bindley keller", "george bradley keller", "george bill keller"
"george boole keller" » "george brown keller", "george bull keller"

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