Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
studies dose » studies ds, studies does, studies die
filologia de » filologia e, fisiologia de, filosofia de
studies do » studies ds, studies d, studies dn
rats case » rates case, raths case, rats causes

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 case ((studies dose) OR (studies do)) filologia de litterature.
• Adding a wildcard symbol may retrieve word variants: rats case ((studies dose) or (studies do)) filologia de litterature*.