Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
di filosofia » la filosofia, e filosofia
sets stable » sets table, setup stable, tests stable
studies di » studies die, studies div, studies ds
set scale » sets scale, belt scale, best scale

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 (set scale)) studies di filosofia del literatura.
• Adding a wildcard symbol may retrieve word variants: ((sets stable) or (set scale)) studies di filosofia del literatura*.