Perhaps you should try some spelling variations:
la literature » la litterature, a literature, la literatura
filosofia la » filosofia da, filosofia le, filosofica da
sets stable » sets table, setup stable, tests stable
tests safe » tests safety, tests scale, tests space
study la » study law, study lay, study lca

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: ((sets stable) OR (tests safe)) study la filosofia la literature.
• Adding a wildcard symbol may retrieve word variants: ((sets stable) or (tests safe)) study la filosofia la literature*.