Perhaps you should try some spelling variations:
da literatura » la literatura, a literatura, de literatura
filosofia da » filosofia de, filosofia del, filosofia e
studien de » studien der, studien die, studien des
studie des » studie der, studium des, studie die
test oral » test oracle, test orn, test oracles

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: "test oral ((studien de) OR (studie des)) filosofia da literatura*".