Perhaps you should try some spelling variations:
bulgeriae » bulgariae, bulgaricae, bulgarian
bulgaria » bulgareia, vulgaria, bulgeria
bulgar » bulgare, vulgar, bulger
bulgarien » bulgareien, vulgarien, bulgerien, bulgarian
bulgaristen » bulgareisten, vulgaristen, bulgeristen, bulgarischen, bulgaristik, bulgarischer
vulgare » vulgar, vulgaris, vulgarly

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