Perhaps you should try some spelling variations:
letteratura araba » letteratura arte, letteratura arti, letteratura greca
letteratura fra » letteratura da, letteratura greca, letteratura sarda
grandi libri » amandi libri, grandi liberali, gran libro
i grandi » i grand, e grandi, i grani
libri x » libri xv, libri v, libri sex

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: i grandi libri x ((letteratura araba) OR (letteratura fra)).
• Adding a wildcard symbol may retrieve word variants: i grandi libri x ((letteratura araba) or (letteratura fra))*.