Perhaps you should try some spelling variations:
lengua literatura » lingual literature, pena literatura, language literature
during soldier » daring soldier, during solder, during solar
en literatura » e literatura, pena literatura, en litterature
tests during » costs during, protests during, testing during

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: tests during soldier _ filosofia ((en literatura) OR (lengua literatura)).
• Adding a wildcard symbol may retrieve word variants: tests during soldier _ filosofia ((en literatura) or (lengua literatura))*.