Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
texto sociali » texto social, text social, texts social
studies doe » studies does, studies dose, studies do
studies de » studies der, studies die, studies due

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: texto sociali ((studies de) OR (studies doe)) filosofia del literatura*.