Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarie, bulgarians, bulgareiae, vulgariae, bulgarieiae
bulgarian » hungarian, bulgareian, vulgarian, bulgarieian
bulgarica » bulgarisch, bulgarie, bulgareica, vulgarica, bulgarieica
bulgarien » 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 (bulgarien OR (bulgarian OR (bulgarica OR bulgaria)))) OR (bulgar OR bulger)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bulgariae or (bulgarien or (bulgarian or (bulgarica OR bulgaria)))) or (bulgar or bulger))".
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (bulgarien or (bulgarian or (bulgarica OR bulgaria)))) or (bulgar or bulger))*.