Perhaps you should try some spelling variations:
la litterature » a literature
la literatura » a literature
delle studie » delle storie, dello studio, delle stufe
de filosofia » e filosofia, di filosofia, la filosofia
testi delle » tesi delle, test delle, testi della
studie de » studie der, studie die, studie des

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: testi delle studie de filosofia ((la literatura) OR (la litterature))*.