Perhaps you should try some spelling variations:
"specimens philosophiae suae" » "species philosophy suae", "species philosophers suae", "specimens philological suae", "specimens philosophicae sive", "specimens philosophicae quas", "specimens philosophiae essay"
"specimen philosophiae slavicae" » "specimen philosophiae publice", "specimen philosophie islamic"
"specimens philologica slavicae" » "specimens philological slavicae", "specimina philologica slavicae", "specimina philologiae slavicae", "specimens philologica slavica", "specimens philologie slave", "specimens philologica sive"
"specimen philologiae slavicae" » "specimina philologiae slavicae", "specimens philological slavicae", "specimina philologica slavicae", "specimen philologica slavica", "specimen 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 philosophiae slavicae") OR ("specimen philologiae slavicae"))) OR ((("specimens philosophiae suae") OR ("specimens philologica slavicae")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"specimen philosophiae slavicae\") OR (\"specimen philologiae slavicae\"))) or (((\"specimens philosophiae suae\") or (\"specimens philologica slavicae\"))))".
• Removing quotes may allow a broader search: (((( specimen philosophiae slavicae ) OR ( specimen philologiae slavicae ))) or ((( specimens philosophiae suae ) or ( specimens philologica slavicae )))).
• Adding a wildcard symbol may retrieve word variants: (((("specimen philosophiae slavicae") OR ("specimen philologiae slavicae"))) or ((("specimens philosophiae suae") or ("specimens philologica slavicae"))))*.