Perhaps you should try some spelling variations:
vulgareiae » bulgariae, vulgarise
bulgerian » bulgarian, bulgarians, eulerian
ungarische » ungarischen
bulgaria » bulgareia, bulgeria, bulgarieia
bulgar » bulgare, bulger, bulgarie

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (((vulgareiae OR bulgerian) OR (ungarische OR bulgaria)) OR ((bulgar OR vulgar) OR bulge)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((vulgareiae or bulgerian) or (ungarische or bulgaria)) or ((bulgar OR vulgar) or bulge))".
• Adding a wildcard symbol may retrieve word variants: (((vulgareiae or bulgerian) or (ungarische or bulgaria)) or ((bulgar OR vulgar) or bulge))*.