Perhaps you should try some spelling variations:
22johann friedrich » johann friedrich (Expand Search), johann friedrichs (Expand Search)
des lutherischenn » der lutherischen (Expand Search), den lutherischen (Expand Search)
des lutherischen » der lutherischen (Expand Search), den lutherischen (Expand Search), von lutherischer (Expand Search)
friedrich i » friedrich iii (Expand Search), friedrich der (Expand Search)
kurfu%cc%88rst%22 » kurtu%cc%88rst%22 (Expand Search), kurzu%cc%88rst%22 (Expand Search), kuru%cc%88rst%22 (Expand Search)
kurf%cc%88rst%22 » kurt%cc%88rst%22 (Expand Search), kurz%cc%88rst%22 (Expand Search), kur%cc%88rst%22 (Expand Search)

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: %22johann friedrich i. - ((des lutherischen) or (des lutherischenn)) (kurfu%cc%88rst%22 OR kurf%cc%88rst%22)~.
• If you are trying to use Boolean operators, they must be ALL CAPS: %22johann friedrich i. - ((des lutherischen) OR (des lutherischenn)) (kurfu%cc%88rst%22 OR kurf%cc%88rst%22).
• The words AND, OR and NOT may confuse the search; try adding quotes: "%22johann friedrich i. - ((des lutherischen) or (des lutherischenn)) (kurfu%cc%88rst%22 OR kurf%cc%88rst%22)".
• Adding a wildcard symbol may retrieve word variants: %22johann friedrich i. - ((des lutherischen) or (des lutherischenn)) (kurfu%cc%88rst%22 OR kurf%cc%88rst%22)*.