Perhaps you should try some spelling variations:
philosophiae slavicae » philologiae slavicae, philosophiae publice, philosophiae suae
speciess philosophiae » specimen philosophiae, species philosophy, species philosophers
philologica slavicae » philologica slavica, philologiae slavicae, philologie slave

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 OR \"species) philosophiae slavicae\") or ((((((\"specimen OR \"species)s philosophiae slavicae\") OR (\"speciess philosophiae slavicae\"))) OR ((\"specimen OR \"species)s philologica slavicae\"))))".
• The words AND, OR and NOT may confuse the search; try adding quotes: "\"(((\\"specimen OR \\"species) philosophiae slavicae\\") or ((((((\\"specimen OR \\"species)s philosophiae slavicae\\") or (\\"speciess philosophiae slavicae\\"))) or ((\\"specimen OR \\"species)s philologica slavicae\\"))))\"".
• Removing quotes may allow a broader search: ((( specimen OR species) philosophiae slavicae ) or (((((( specimen OR species)s philosophiae slavicae ) or ( speciess philosophiae slavicae ))) or (( specimen OR species)s philologica slavicae )))).