Perhaps you should try some spelling variations:
di literatura » de literatura, da literatura, ii literatura
filosofia di » filosofia de, filosofia da, filosofia del
test duales » test doubles, test oracles, test dummies
test rules » best rules, test rule, trust rules

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 duales) OR (test rules)) studium _ filosofia di literatura*.