Perhaps you should try some spelling variations:
"michael kelly author" » "michael heller author", "michael kirby author", "michael kelly anthony", "michael henry author", "michael only author"
"michael della author" » "michael heller author", "michael cells author", "michael wells author", "michael bellamy author", "michael dlla author", "michael _lla author", "michael alla author"
"michael de author" » "michael d author", "michael _ author", "michael a author", "michael e author", "michael code author", "michael dove author"

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: (("michael kelly author") OR ((("michael della author") OR ("michael de author"))))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"michael kelly author\") or (((\"michael della author\") OR (\"michael de author\"))))*".
• Removing quotes may allow a broader search: (( michael kelly author ) or ((( michael della author ) OR ( michael de author ))))*.