Perhaps you should try some spelling variations:
"meta philosophical pessimism" » "meta philosophical presentism", "meta philosophical feminism", "meta philosophical scepticism", "a metaphilosophical pessimism", "a philosophical pessimism", "medical philosophical pessimism"
"meta philosophical humanism" » "meta philosophical feminism", "meta philosophical posthumanism", "meta philosophical idealism", "a metaphilosophical humanism", "a philosophical humanism", "medical philosophical humanism"
"acta philosophical realism" » "acta philosophical idealism", "acta philosophical treatise", "acta philosophical egoism", "art philosophical realism", "a philosophical realism", "all philosophical realism"

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: (("acta philosophical realism") OR ((("meta philosophical humanism") OR ("meta philosophical pessimism")))).
• Removing quotes may allow a broader search: (( acta philosophical realism ) or ((( meta philosophical humanism ) or ( meta philosophical pessimism )))).
• Adding a wildcard symbol may retrieve word variants: (("acta philosophical realism") or ((("meta philosophical humanism") or ("meta philosophical pessimism"))))*.