Perhaps you should try some spelling variations:
pena literatura » na literatura, lengua literatura, la literatura
pela literatura » la literatura, a literatura, de literatura
during soldier » daring soldier, during solder, during solar
en literatura » e literatura, en litterature, la literatura
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 (((pena literatura) OR (pela literatura)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tests during soldier _ filosofia ((en literatura) or (((pena literatura) OR (pela literatura))))".
• Adding a wildcard symbol may retrieve word variants: tests during soldier _ filosofia ((en literatura) or (((pena literatura) OR (pela literatura))))*.