Perhaps you should try some spelling variations:
national » nationale (Expand Search), nationala (Expand Search), nationaler (Expand Search)
nationalen » nationaleen (Expand Search), nationalaen (Expand Search), nationaleren (Expand Search), nationale (Expand Search)
nationalaenaena » nationaleaenaena (Expand Search), nationalaaenaena (Expand Search), nationaleraenaena (Expand Search)
nationalenaeren » nationaleenaeren (Expand Search), nationalaenaeren (Expand Search), nationalerenaeren (Expand Search), nationaleaeren (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 (nationalen OR nationalaenaena)) OR nationalenaeren) universitat of kharkiv~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((national OR (nationalen OR nationalaenaena)) OR nationalenaeren) universitat of kharkiv".
• Adding a wildcard symbol may retrieve word variants: ((national OR (nationalen OR nationalaenaena)) OR nationalenaeren) universitat of kharkiv*.