Perhaps you should try some spelling variations:
das filosofia » da filosofia, la filosofia, di filosofia
filosofia a » filosofia da, filosofia la, filosofia e
tests have » guests have, sets have, costs have
texts have » texts case, texts ha
studie das » studie des, studie der, studie am

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: "((tests have) OR (texts have)) studie das filosofia a literature".
• Adding a wildcard symbol may retrieve word variants: ((tests have) OR (texts have)) studie das filosofia a literature*.