Perhaps you should try some spelling variations:
bulgaricae » bulgarische, bulgarian, bulgarie, bulgariane, bulgariene, bulgareicae, vulgaricae, bulgarieicae
bulgariene » bulgarien, bulgariens, bulgarian, bulgareiene, vulgariene, bulgarieiene
bulgarica » bulgarisch, bulgarian, bulgarien, bulgareica, vulgarica, bulgarieica
bulgaria » bulgareia, vulgaria, bulgarieia
bulgar » bulgare, vulgar, bulgarie
bulger » bulge, bulges
bulgere » bulgee, bulgese, bulgare, bilgere, burgere

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• Removing quotes may allow a broader search: ((((bulgaricae OR bulgariene) or bulgarica) or bulgaria) or ((bulgar or bulger) or bulgere)).