Perhaps you should try some spelling variations:
german » germans (Expand Search)
gehrmann » hermann (Expand Search), germans (Expand Search), herrmann (Expand Search)
national » nationale (Expand Search), nationala (Expand Search), nationalen (Expand Search)
nationaler » nationaleer (Expand Search), nationalaer (Expand Search), nationalener (Expand Search), nationale (Expand Search), nationalen (Expand Search), nationala (Expand Search)
academic » academia (Expand Search), akademie (Expand Search)
academie » akademie (Expand Search), academia (Expand Search)

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: "(german OR gehrmann) (national OR nationaler) (academic OR academie) of sciences leopoldina~".
• Adding a wildcard symbol may retrieve word variants: (german OR gehrmann) (national OR nationaler) (academic OR academie) of sciences leopoldina*.