Perhaps you should try some spelling variations:
"georg eichen friedrich hegel" » "georg eichhorn friedrich hegel", "georg zwischen friedrich hegel", "georg cohen friedrich hegel", "georg michel friedrich hegel", "georg michael friedrich hegel", "georg fischer friedrich hegel"
"george wilhelm friedrich engels" » "georg wilhelm friedrich engels", "gehrke wilhelm friedrich engels", "georg vilhelm friedrich engels"

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: (("georg eichen friedrich hegel") OR ("george wilhelm friedrich engels")).
• Removing quotes may allow a broader search: (( georg eichen friedrich hegel ) or ( george wilhelm friedrich engels )).
• Adding a wildcard symbol may retrieve word variants: (("georg eichen friedrich hegel") or ("george wilhelm friedrich engels"))*.