Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarians, vulgariae, bulgeriae
bulgeriae » bulgaricae, bulgarian, bulweria
bulgar » vulgar, bulger
bulgarie » vulgarie, bulgerie, bulgarien, bulgarian, vulgaris
bulgaria » vulgaria, bulgeria
bulgare » vulgare, bulgere, bulgarien, vulgares

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