Perhaps you should try some spelling variations:
bulgeriae » bulgariae, bulgaricae, bulgarian
bulgerien » bulgarien, bulgariens, bulgarian
bulgareiae » bulgariae, bulgarian, bulgarie, bulgareeiae, vulgareiae, bulgereiae
bulgarica » bulgarisch, bulgarian, bulgarien, bulgareica, vulgarica, bulgerica
bulgaria » bulgareia, vulgaria, bulgeria
bulgar » bulgare, vulgar, bulger
bulges » bulge

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: ((((bulgeriae OR bulgerien) OR bulgareiae) OR (bulgaria OR bulgarica)) OR (bulgar OR bulges)).
• Adding a wildcard symbol may retrieve word variants: ((((bulgeriae or bulgerien) or bulgareiae) or (bulgaria or bulgarica)) or (bulgar or bulges))*.