Perhaps you should try some spelling variations:
specimens philosophiae » species philosophy, species philosophers, specimens philological
philosophiae slavicae » philologiae slavicae, philosophiae publice, philologica slavicae
specimen » species
specimens » speciess

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: (( specimen philosophiae slavicae ) OR ( specimens philosophiae slavicae )).
• Adding a wildcard symbol may retrieve word variants: (( specimen philosophiae slavicae ) or ( specimens philosophiae slavicae ))*.