Perhaps you should try some spelling variations:
national » nationala (Expand Search), nationalen (Expand Search), nationaler (Expand Search)
nationalenaes » nationalaenaes (Expand Search), nationalenenaes (Expand Search), nationalerenaes (Expand Search), nationalen (Expand Search), nationales (Expand Search)
nationalaen » nationalaaen (Expand Search), nationalenaen (Expand Search), nationaleraen (Expand Search), nationalen (Expand Search), nationala (Expand Search), nationaler (Expand Search)
nationale » nationalae (Expand Search), nationalene (Expand Search), nationalere (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: (((national OR nationalenaes) OR nationalaen) OR nationale) academic of sciences of ukraine~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((national OR nationalenaes) OR nationalaen) OR nationale) academic of sciences of ukraine".
• Adding a wildcard symbol may retrieve word variants: (((national OR nationalenaes) OR nationalaen) OR nationale) academic of sciences of ukraine*.