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
bulgarica » bulgarisch, bulgarien, bulgareica, vulgarica, bulgerica
bulgaria » bulgareia, vulgaria, bulgeria
bulgar » bulgare, vulgar, bulger
bulges » bulge

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 (bulgarica OR bulgaria)))) OR (bulgar OR bulges)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bulgariae or (bulgarie or (bulgarian or (bulgarica OR bulgaria)))) or (bulgar or bulges))".
• Adding a wildcard symbol may retrieve word variants: ((bulgariae or (bulgarie or (bulgarian or (bulgarica OR bulgaria)))) or (bulgar or bulges))*.