Perhaps you should try some spelling variations:
bulgaricae » bulgarica, bulgarische, bulgarian, bulgericae, bulgarieicae
bulgaria » bulgeria, bulgarieia
bulgar » bulger, bulgarie
bulgare » bulgere, bulgariee, bulgarie, vulgare, bulgarien
bulges » bulge
bilgere » bilger, bilgeri, billigere

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