Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarians, bulgarien, bulgareiae, vulgariae
bulgarie » bulgarien, vulgaris, vulgare, bulgareie, vulgarie
bulgarian » hungarian, bulgareian, vulgarian
bulgarica » bulgarisch, bulgarien, bulgareica, vulgarica
bulgaria » bulgareia, vulgaria
bulgar » bulgare, vulgar
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 (bulgarie 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 (bulgarie or (bulgarian or (bulgarica OR bulgaria)))) or (bulgar or bulger))".
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (bulgarie or (bulgarian or (bulgarica OR bulgaria)))) or (bulgar or bulger))*.