Perhaps you should try some spelling variations:
da literatura » la literatura, a literatura, de literatura
filosofia da » filosofia de, filosofia del, filosofia e
studies doe » studies does, studies dose, studies do
test scale » tests scale, best scale, rest scale
studies de » studies der, studies die, studies due

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 scale ((studies de) OR (studies doe)) filosofia da literatura*".