Perhaps you should try some spelling variations:
da literatura » la literatura, a literatura, de literatura
de filosofia » e filosofia, di filosofia, la filosofia
filosofia da » filosofia de, filosofia del, filosofia e
tests scale » tests stable, sets scale, tests safe
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((test scale) OR (tests scale)) studies de filosofia da literatura*".