Perhaps you should try some spelling variations:
da literatura » la literatura, a literatura, na literatura
de literatura » de litterature, la literatura, y literatura
duale studie » duale studien, duale studium, duales studium
e filosofia » la filosofia
studie e » studie 2, studie _, studie 1
testo » test, tests, texto

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "testo duale studie e filosofia ((da literatura) OR (de literatura))".
• Adding a wildcard symbol may retrieve word variants: testo duale studie e filosofia ((da literatura) OR (de literatura))*.