Perhaps you should try some spelling variations:
stable study » table study, stable steady, scale study
de filosofia » e filosofia, la filosofia, a filosofia
di filosofia » la filosofia, e filosofia
e literatura » de literatura, y literatura, e literatur
belt stable » salt stable, belt scale, tilt stable

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: belt stable study ((de filosofia) OR (di filosofia)) e literatura.
• Adding a wildcard symbol may retrieve word variants: belt stable study ((de filosofia) or (di filosofia)) e literatura*.