Perhaps you should try some spelling variations:
groups studied » group studies, groups study
der filosofia » de filosofia, e filosofia, di filosofia
na literatura » la literatura, a literatura, a literature
tests groups » test groups, sets groups, hosts groups
filosofia na » filosofia da, filosofia la, filosofia n
studied der » studie der, studien der, studies der

You may be able to get more results by adjusting your search query.

• Adding a wildcard symbol may retrieve word variants: tests groups studied der filosofia na literatura*.