Perhaps you should try some spelling variations:
de litterature » la litterature
et litterature » la litterature, art literature
case studies » case study
e filologia » de filologia, di filologia, e fisiologia
rats case » rates case, raths case, rcts case

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "rats case studies e filologia ((de litterature) OR (et litterature))*".