Perhaps you should try some spelling variations:
"medioevo romano et orientale" » "medioevo romano e orientale", "medioevo roman et orientale", "medioevo romanis et orientale"
"Medioevo romains et orientale" » "Medioevo domains et orientale", "Medioevo romain et orientale", "Medioevo romaine et orientale"

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: (("medioevo romano et orientale") OR ("Medioevo romains et orientale")).
• Removing quotes may allow a broader search: (( medioevo romano et orientale ) or ( Medioevo romains et orientale )).
• Adding a wildcard symbol may retrieve word variants: (("medioevo romano et orientale") or ("Medioevo romains et orientale"))*.