Perhaps you should try some spelling variations:
da literatura » la literatura, a literatura, de literatura
filosofica da » filosofia da, filosofia de, filosofia di
e filosofica » e filosofia, e filosofiche, a filosofia
1 studies » 2 studies, 4 studies, 3 studies
1 studie » 1 studien, 3 studie, 11 studies

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: test ((1 studie) OR (1 studies)) e filosofica da literatura.
• Adding a wildcard symbol may retrieve word variants: test ((1 studie) or (1 studies)) e filosofica da literatura*.