Perhaps you should try some spelling variations:
"specimens philological slavicae" » "specimina philologica slavicae", "specimen histological slavicae", "specimen pathological slavicae", "specimens philologica slavicae", "specimens philologica slavica", "specimens philological polemical"
"specimens philologiae slavicae" » "specimina philologiae slavicae", "specimen philosophiae slavicae", "specimina philologica slavicae", "specimens philologica slavicae", "specimens philologica slavica"
"specimens philologie slave" » "specimina philologiae slave", "specimina philologica slave", "specimen philosophiae slave"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("specimens philological slavicae") OR ((("specimens philologiae slavicae") OR ("specimens philologie slave")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"specimens philological slavicae\") or (((\"specimens philologiae slavicae\") OR (\"specimens philologie slave\"))))".
• Removing quotes may allow a broader search: (( specimens philological slavicae ) or ((( specimens philologiae slavicae ) OR ( specimens philologie slave )))).
• Adding a wildcard symbol may retrieve word variants: (("specimens philological slavicae") or ((("specimens philologiae slavicae") OR ("specimens philologie slave"))))*.