Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarian, bulgarians, bulgareiae, bulgeriae
bulgarie » bulgarien, bulgarian, vulgaris, bulgareie, bulgerie
bulgaria » bulgareia, bulgeria
bulgar » bulgare, bulger

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