Perhaps you should try some spelling variations:
bulgare » vulgare, bulgaria, vulgares, bulgere, bulgariae
bulgarien » bulgarian, bulgaria, bulgariann, vulgarisn, vulgarien, bulgerien, bulgariaien
bulgarie » bulgaria, bulgarian, vulgaris, vulgarie, bulgerie, bulgariaie
bulgeriens » bulgariens, algeriens, euleriens
bulgarians » bulgarian, bulgariens, bulgaria, vulgarians, bulgerians, bulgariaians
bulgar » vulgar, bulger, bulgaria

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• Removing quotes may allow a broader search: (((bulgare OR bulgarien) or (bulgarie or (bulgeriens or bulgarians))) or bulgar).