Perhaps you should try some spelling variations:
bulgariaiae » bulgaricae, bulgariae
bulgariia » bulgaricae, bulgarien, bulgarie
bulgarian » hungarian
bulgarica » bulgarisch, bulgarien, 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: (((bulgariaiae OR bulgariia) OR (bulgarian OR bulgarica)) OR (bulgaria OR bulger)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((bulgariaiae OR bulgariia) or (bulgarian or bulgarica)) or (bulgaria or bulger))".
• Adding a wildcard symbol may retrieve word variants: (((bulgariaiae OR bulgariia) or (bulgarian or bulgarica)) or (bulgaria or bulger))*.