Perhaps you should try some spelling variations:
bulgeriae » bulgariae, bulgaricae, bulgarian, bulgesiae
bulgaria » bulgareia
bulgar » bulgare
bulgarie » bulgareie, bulgarien, bulgarian, vulgaris
bulger » 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: ((bulgeriae OR bulgaria) OR ((((bulgar OR bulgarie) OR vulgar) OR bulge) OR bulger)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((bulgeriae or bulgaria) or ((((bulgar OR bulgarie) or vulgar) or bulge) or bulger))".
• Adding a wildcard symbol may retrieve word variants: ((bulgeriae or bulgaria) or ((((bulgar OR bulgarie) or vulgar) or bulge) or bulger))*.