Perhaps you should try some spelling variations:
lia filosofia » la filosofia, alla filosofia, fija filosofia
le literatura » la literatura, de literatura, de litteratura
e literatura » de literatura, y literatura, e literatur
studies lia » studies lca, studies li, studies lit

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: plants safety studies lia filosofia ((le literatura) OR (e literatura)).
• Adding a wildcard symbol may retrieve word variants: plants safety studies lia filosofia ((le literatura) or (e literatura))*.