Perhaps you should try some spelling variations:
de litterature » la litterature, et litterature
de literature » de lite'rature, de literatura, e literature
yeasts situ » yeasts site, yeasts study, yeasts using
a filosofia » e filosofia, di filosofia

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: yeasts situ study ((a filosofia) OR (la filosofia)) ((de literature) OR (de litterature)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "yeasts situ study ((a filosofia) or (la filosofia)) ((de literature) OR (de litterature))".
• Adding a wildcard symbol may retrieve word variants: yeasts situ study ((a filosofia) or (la filosofia)) ((de literature) OR (de litterature))*.