Perhaps you should try some spelling variations:
german » germans (Expand Search), gehrmann (Expand Search)
national » nationale (Expand Search), nationalen (Expand Search), nationaler (Expand Search)
nationala » nationalea (Expand Search), nationalena (Expand Search), nationalera (Expand Search), nationale (Expand Search), nationalen (Expand Search), nationaler (Expand Search)
nationalene » nationaleene (Expand Search), nationalenene (Expand Search), nationalerene (Expand Search), nationalen (Expand Search), nationale (Expand Search), nationaler (Expand Search)
academic » academia (Expand Search), academie (Expand Search), akademie (Expand Search)

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

• Performing a fuzzy search may retrieve terms with similar spellings: (german OR hermann) ((national OR nationala) OR nationalene) academic of sciences leopoldina~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(german OR hermann) ((national OR nationala) OR nationalene) academic of sciences leopoldina".
• Adding a wildcard symbol may retrieve word variants: (german OR hermann) ((national OR nationala) OR nationalene) academic of sciences leopoldina*.