Perhaps you should try some spelling variations:
german » gehrmann (Expand Search)
germans » gehrmanns (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)
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 germans) (national OR (nationala OR nationale)) academic of sciences leopoldina~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(german OR germans) (national OR (nationala OR nationale)) academic of sciences leopoldina".
• Adding a wildcard symbol may retrieve word variants: (german OR germans) (national OR (nationala OR nationale)) academic of sciences leopoldina*.