Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, e literatura
da literatura » la literatura, a literatura, de literatura
de filosofia » e filosofia, di filosofia, la filosofia
test scale » tests scale, best scale, rest scale
study de » study die, study der, study dem

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 study de filosofia ((del literatura) OR (da literatura)).
• Adding a wildcard symbol may retrieve word variants: test scale study de filosofia ((del literatura) or (da literatura))*.