Perhaps you should try some spelling variations:
"michael henry author" » "michel henry author", "michael henein author", "michel henry's author", "michael theory author", "michael henry arthur", "michael hervey author"
"michael goller author" » "michael collier author", "michael collyer author", "michael gother 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 henry author") OR ("michael goller author")).
• Removing quotes may allow a broader search: (( michael henry author ) or ( michael goller author )).
• Adding a wildcard symbol may retrieve word variants: (("michael henry author") or ("michael goller author"))*.