Perhaps you should try some spelling variations:
"johann gottfried michael" » "johann gottfredson michael", "johann gottfried wilhelm", "johann fried michael"
"johann gottfried fichte" » "johann gottlieb fichte", "johann gottfried biewe", "johann gottfried kate"

You may be able to get more results by adjusting your search query.

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