Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarien, bulgareiae, vulgariae
bulgarie » bulgarien, bulgarian, vulgaris, bulgareie, vulgarie
bulgarians » bulgarian, bulgariens, bulgarien, bulgareians, vulgarians
bulgarica » bulgarisch, bulgarian, 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 (bulgarians OR (bulgarica OR bulgaria)))) OR (bulgar OR bulger)).
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (bulgarie or (bulgarians or (bulgarica or bulgaria)))) or (bulgar or bulger))*.