Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarian, bulgeriae, bulgariaiae, bulgarieiae
bulgar » bulger, bulgaria, bulgarie
bulgare » bulgere, bulgariae, bulgariee, bulgarie, bulgarien, bulgaria
bulgerian » bulgarian, bulgarians, bulgaria
vulgare » 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: (bulgariae OR (((bulgar OR bulgerian) OR vulgar) OR (bulgare OR vulgare))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(bulgariae or (((bulgar or bulgerian) or vulgar) or (bulgare OR vulgare)))".
• Adding a wildcard symbol may retrieve word variants: (bulgariae or (((bulgar or bulgerian) or vulgar) or (bulgare OR vulgare)))*.