Perhaps you should try some spelling variations:
gehrmann » germans (Expand Search), herrmann (Expand Search)
national » nationalen (Expand Search), nationaler (Expand Search), nationales (Expand Search)
nationala » nationalena (Expand Search), nationalera (Expand Search), nationalesa (Expand Search), nationalen (Expand Search), nationaler (Expand Search)
nationale » nationalene (Expand Search), nationalere (Expand Search), nationalese (Expand Search)
academie » akademie (Expand Search), academia (Expand Search), academic (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: "(gehrmann OR hermann) (national OR (nationala OR nationale)) academie of sciences leopoldina~".
• Adding a wildcard symbol may retrieve word variants: (gehrmann OR hermann) (national OR (nationala OR nationale)) academie of sciences leopoldina*.