Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarie, bulgareiae, vulgariae, bulgeriae
bulgarian » bulgaria, hungarian, bulgareian, vulgarian, bulgerian
bulgarische » bulgarischen, ungarische, bulgareische, vulgarische, bulgerische
vulgaria » bulgaria, vulgaris, vulgari
bulgar » bulgare, vulgar, bulger

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 bulgarian) OR (bulgarische OR (vulgaria OR vulgaria))) OR (bulgar OR bulge)).
• Adding a wildcard symbol may retrieve word variants: (((bulgariae or bulgarian) or (bulgarische or (vulgaria or vulgaria))) or (bulgar or bulge))*.