Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
fisiologia de » fisiologia e, fisiologia della, sociologia de
studies dose » studies ds, studies do, studies die
studies does » studies dress, studies ds, studies der
rat gavage » rats gavage, oral gavage

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: "rat gavage ((studies dose) OR (studies does)) fisiologia de litterature".
• Adding a wildcard symbol may retrieve word variants: rat gavage ((studies dose) OR (studies does)) fisiologia de litterature*.