Perhaps you should try some spelling variations:
filosofica da » filosofia da, filosofia de, filosofia di
tests stable » tests table, sets stable, test table
filosofia la » filosofia da, filosofia le, filosofia das
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: ((tests stable) OR (tests safe)) study la ((filosofia la) OR (filosofica da)) literature.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tests stable) or (tests safe)) study la ((filosofia la) OR (filosofica da)) literature".
• Adding a wildcard symbol may retrieve word variants: ((tests stable) or (tests safe)) study la ((filosofia la) OR (filosofica da)) literature*.