Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
der filologia » de filologia, di filologia, e filologia
filologia de » filologia e, fisiologia de, filosofia de
studies der » studies ds, studies d, studies dn
rats » rate, rat

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: (rats OR rays) gavage studies der filologia de litterature.
• Adding a wildcard symbol may retrieve word variants: (rats or rays) gavage studies der filologia de litterature*.