Perhaps you should try some spelling variations:
stable student » table student, scale student, enable students
de literatura » de litterature, y literatura, a literatura
la literatura » la litterature, a literature
less stable » less liable, cells stable
a filosofia » la filosofia, e filosofia, di filosofia
student a » student _

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: less stable student a filosofia ((de literatura) OR (la literatura)).
• Adding a wildcard symbol may retrieve word variants: less stable student a filosofia ((de literatura) or (la literatura))*.