Perhaps you should try some spelling variations:
"historian of philosophy" » "historians of philosophy", "historia of philosophy", "historical of philosophy"
"historiess of philosophy" » "histories of philosophy", "historiese of philosophy", "historikers of philosophy"
"historiens of philosophy" » "histories of philosophy", "historians of philosophy", "historien of philosophy"

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