Perhaps you should try some spelling variations:
bulgariae » bulgarians, bulgarien, bulgare, bulgareiae
bulgarie » bulgarien, vulgaris, vulgare, bulgareie
bulgaricae » bulgarica, bulgarische, bulgarischen, bulgareicae
bulgarian » hungarian, bulgareian
bulgarisch » bulgarische, bulgarischen, bulgareisch
bulgaria » bulgareia
bulgar » bulgare
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 bulgarie) OR bulgaria) OR (bulgaricae OR (bulgarian OR bulgarisch))) OR ((bulgar OR vulgar) OR bulger)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((bulgariae or bulgarie) or bulgaria) or (bulgaricae or (bulgarian or bulgarisch))) or ((bulgar OR vulgar) or bulger))".
• Adding a wildcard symbol may retrieve word variants: ((((bulgariae or bulgarie) or bulgaria) or (bulgaricae or (bulgarian or bulgarisch))) or ((bulgar OR vulgar) or bulger))*.