Perhaps you should try some spelling variations:
christian gotthilf » christian gottlieb
christian gottlob » christian gottlieb
gottlob frage » gottlob frege, gottlob kruger
frege » freie

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: (( christian gottlob frage ) OR ( christian gotthilf frege )).
• Adding a wildcard symbol may retrieve word variants: (( christian gottlob frage ) or ( christian gotthilf frege ))*.