Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgarians, bulgarien, bulgareiae, vulgariae, bulgeriae
bulgarie » bulgarien, vulgaris, vulgare, bulgareie, vulgarie, bulgerie
bulgarian » hungarian, bulgareian, vulgarian, bulgerian
bulgarische » bulgarischen, ungarische, bulgareische, vulgarische, bulgerische
bulgaria » bulgareia, vulgaria, bulgeria
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 bulgarie) OR bulgarian) OR (bulgarische OR bulgaria)) OR (bulgar OR bulge))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((bulgariae OR bulgarie) or bulgarian) or (bulgarische or bulgaria)) or (bulgar or bulge))*".