Perhaps you should try some spelling variations:
filosofia le » filosofia de, filosofia del, filosofia da
filosofia e » filosofia de, filosofia del
de studio » de estudio, di studio, dvd studio
tests de » tests der, tests die, tests des
studio e » studio et, studio _, studio a

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 de studio e ((filosofia le) OR (filosofia e)) literatura".
• Adding a wildcard symbol may retrieve word variants: tests de studio e ((filosofia le) OR (filosofia e)) literatura*.