Perhaps you should try some spelling variations:
bulgariae » bulgaricae, bulgaria, bulgarian, bulgareiae, vulgariae, bulgeriae
vulgareia » bulgaria, vulgaris, vulgare
bulgarica » bulgaria, bulgarian, bulgarien, bulgareica, vulgarica, bulgerica
bulgarisch » bulgarische, bulgarischen, bulgareisch, vulgarisch, bulgerisch
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 vulgareia) OR (bulgariae OR (bulgarica OR bulgarisch))) OR (bulgar OR bulges)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((bulgariae or vulgareia) or (bulgariae or (bulgarica OR bulgarisch))) or (bulgar or bulges))".
• Adding a wildcard symbol may retrieve word variants: (((bulgariae or vulgareia) or (bulgariae or (bulgarica OR bulgarisch))) or (bulgar or bulges))*.