Perhaps you should try some spelling variations:
philologica slavicae » philologica slavica, philologie slave, philologica sive
philologiae 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: (( specimina ((philologica slavicae) OR (philologiae slavicae)) ) OR ( specimen philosophiae suae )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( specimina ((philologica slavicae) OR (philologiae slavicae)) ) or ( specimen philosophiae suae ))".
• Adding a wildcard symbol may retrieve word variants: (( specimina ((philologica slavicae) OR (philologiae slavicae)) ) or ( specimen philosophiae suae ))*.