Perhaps you should try some spelling variations:
la litterature » a literature
fisiologia la » fisiologia e, fisiologia de, fisiologia 1
studies dose » studies ds, studies do, studies die
studies does » studies dress, studies ds, studies der
rats » rate, rays

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 rat) gavage ((studies dose) OR (studies does)) fisiologia la litterature.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(rats or rat) gavage ((studies dose) OR (studies does)) fisiologia la litterature".
• Adding a wildcard symbol may retrieve word variants: (rats or rat) gavage ((studies dose) OR (studies does)) fisiologia la litterature*.