Perhaps you should try some spelling variations:
law filosofia » la filosofia, a filosofia, da filosofia
le literatura » la literatura, e literatura, de litteratura
de literatura » de litterature, la literatura, y literatura
safety study » safety studies

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: guests ((safety study) OR (safety stock)) law filosofia ((le literatura) OR (de literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "guests ((safety study) OR (safety stock)) law filosofia ((le literatura) or (de literatura))".
• Adding a wildcard symbol may retrieve word variants: guests ((safety study) OR (safety stock)) law filosofia ((le literatura) or (de literatura))*.