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

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("specimina philologica slavica") OR ("specimina philologica slavicae"))) OR ("specimens philological slavicae")).
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• Adding a wildcard symbol may retrieve word variants: (((("specimina philologica slavica") or ("specimina philologica slavicae"))) or ("specimens philological slavicae"))*.