Perhaps you should try some spelling variations:
vulgariae » bulgariae, vulgarise, bulgaricae
bulgarian » hungarian, bulgareian, vulgarian, bulgarieian
bulgariaica » bulgarica, bulgariia, bulgareiaica, vulgariaica, bulgarieiaica
bulgaria » bulgareia, vulgaria, bulgarieia
bulgar » bulgare, vulgar, 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: ((vulgariae OR (bulgarian OR (bulgariaica OR bulgaria))) OR (bulgar OR bulger)).
• Adding a wildcard symbol may retrieve word variants: ((vulgariae or (bulgarian or (bulgariaica or bulgaria))) or (bulgar or bulger))*.