Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarians, bulgarien, bulgareiae, vulgariae
bulgarie » bulgarien, vulgaris, vulgare, bulgareie, vulgarie
bulgarische » bulgarischen, ungarische, bulgarischene, bulgareische, vulgarische
bulgarian » hungarian, bulgareian, vulgarian
bulgarisch » bulgarischen, bulgareisch, vulgarisch
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 bulgaria) OR (bulgarische OR (bulgarian OR bulgarisch))) OR (bulgar OR bulger)).
• Adding a wildcard symbol may retrieve word variants: ((((bulgariae or bulgarie) or bulgaria) or (bulgarische or (bulgarian or bulgarisch))) or (bulgar or bulger))*.