Perhaps you should try some spelling variations:
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)
nationaleen » nationaleneen (Expand Search), nationalereen (Expand Search), nationaleseen (Expand Search), nationalen (Expand Search), nationaler (Expand Search), nationales (Expand Search)
nationalenaen » nationalenenaen (Expand Search), nationalerenaen (Expand Search), nationalesenaen (Expand Search), nationalitaten (Expand Search), nationalen (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 (((nationala OR nationale) OR nationaleen) OR nationalenaen)) universitat of kharkiv~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(national OR (((nationala OR nationale) OR nationaleen) OR nationalenaen)) universitat of kharkiv".
• Adding a wildcard symbol may retrieve word variants: (national OR (((nationala OR nationale) OR nationaleen) OR nationalenaen)) universitat of kharkiv*.