Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarie, bulgarians, bulgareiae, vulgariae, bulgeriae
bulgarian » hungarian, bulgareian, vulgarian, bulgerian
bulgarica » bulgarisch, bulgarie, bulgareica, vulgarica, bulgerica
bulgarien » bulgareien, vulgarien, bulgerien
bulgaria » bulgareia, vulgaria, bulgeria
bulgar » bulgare, vulgar, bulger
bulges » bulge

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: (((((bulgariae OR bulgarian) OR bulgarien) OR bulgaria) OR bulgarica) OR (bulgar OR bulges)).
• Adding a wildcard symbol may retrieve word variants: (((((bulgariae or bulgarian) or bulgarien) or bulgaria) or bulgarica) or (bulgar or bulges))*.