Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarie, bulgareiae, vulgariae, bulgarieiae
bulgarica » bulgarisch, bulgarian, bulgarie, bulgareica, vulgarica, bulgarieica
bulgarien » bulgarian, bulgareien, vulgarien, bulgarieien
bulgaria » bulgareia, vulgaria, bulgarieia
bulgar » bulgare, vulgar, bulgarie
bulger » bulge, bulges

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 bulgaria) OR (bulgariae OR (bulgarica OR bulgarien))) OR (bulgar OR bulger)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((bulgariae or bulgaria) or (bulgariae or (bulgarica OR bulgarien))) or (bulgar or bulger))".
• Adding a wildcard symbol may retrieve word variants: (((bulgariae or bulgaria) or (bulgariae or (bulgarica OR bulgarien))) or (bulgar or bulger))*.