Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarian, bulgareiae, bulgariaiae, bulgarieiae
vulgari » vulgaris, vulgare, bulgaria
bulgariaisch » bulgarisch, bulgarische, bulgarians, bulgareiaisch, bulgariaiaisch, bulgarieiaisch
bulgar » bulgare, bulgaria, bulgarie
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 (vulgari OR bulgariaisch)) OR ((bulgar OR vulgar) OR bulger)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bulgariae or (vulgari or bulgariaisch)) or ((bulgar OR vulgar) or bulger))".
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (vulgari or bulgariaisch)) or ((bulgar OR vulgar) or bulger))*.