Perhaps you should try some spelling variations:
specimen philologiae » specimina philologiae, specimens philological, specimina philologica
philologiae slavicae » philologica slavicae, philologica slavica, philologie slave
philosophiae suae » philosophicae sive, philosophicae quas, philosophiae essay

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