Perhaps you should try some spelling variations:
de filosofia » e filosofia, di filosofia, la filosofia
e literatura » de literatura, y literatura, e literatur
tests scale » tests stable, sets scale, tests safe
filosofia e » filosofia de, filosofia del
test scale » best scale, rest scale, treat scale
studies de » studies der, studies die, studies doe

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: ((test scale) OR (tests scale)) studies de filosofia e literatura*.