Perhaps you should try some spelling variations:
"michael kelly author" » "michael heller author", "michael kelly anthony", "michael henry author", "michael only author"
"michael della author" » "michael heller author", "michael de author", "michael cells author", "michael wells author", "michael bellamy author"
"michael kirby author" » "michael derby author", "michael burnby author", "michael kirby anthony"

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