Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
de filologia » di filologia, de filosofia, e fisiologia
filologia de » filologia e, fisiologia de, filosofia de
studies de » studies der, studies die, studies doe
rats » rate, rays

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 OR rat) gavage studies de filologia de litterature*".