Perhaps you should try some spelling variations:
national » nationale (Expand Search), nationala (Expand Search), nationalen (Expand Search)
nationalaena » nationaleaena (Expand Search), nationalaaena (Expand Search), nationalenaena (Expand Search), nationalen (Expand Search), nationale (Expand Search), nationala (Expand Search)
nationalees » nationaleees (Expand Search), nationalaees (Expand Search), nationalenees (Expand Search), nationales (Expand Search), nationale (Expand Search), nationalen (Expand Search)
nationaleer » nationaleeer (Expand Search), nationalaeer (Expand Search), nationaleneer (Expand Search), nationaler (Expand Search), nationale (Expand Search), nationalen (Expand Search)
rationalen » nationalen (Expand Search), nationale (Expand Search), nationaler (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 (nationalaena OR (rationalen OR nationalees))) OR nationaleer) universitat of kharkiv~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((national OR (nationalaena OR (rationalen OR nationalees))) OR nationaleer) universitat of kharkiv".
• Adding a wildcard symbol may retrieve word variants: ((national OR (nationalaena OR (rationalen OR nationalees))) OR nationaleer) universitat of kharkiv*.