Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarian, bulgareiae, vulgariae, bulgariaiae
bulgarien » bulgarian, bulgaria, bulgareien, vulgarien, bulgariaien
bulgareiae » bulgaria, bulgarian, bulgarie, bulgareeiae, vulgareiae, bulgariaeiae
vulgaricae » bulgaricae, bulgarica, vulgaridad
bulgar » bulgare, vulgar, bulgaria
bulger » bulge, bulges

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 bulgarien) OR bulgareiae) OR vulgaricae) OR (bulgar OR bulger)).
• Adding a wildcard symbol may retrieve word variants: ((((bulgariae or bulgarien) or bulgareiae) or vulgaricae) or (bulgar or bulger))*.