Perhaps you should try some spelling variations:
"specimens philological slavicae" » "specimina philologica slavicae", "specimen pathological slavicae", "species physiological slavicae", "specimens philologica slavicae", "specimens philologica slavica", "specimens philological polemical"
"specimina philologiae slavicae" » "specimina philologica slavicae", "specimen philosophiae slavicae", "specimina philologica slavica", "specimina philologie slave"
"specimen histological slavicae" » "specimen pathological slavicae", "special histologic slavicae", "aspects histological slavicae", "specimen histological slices", "specimen philologica slavicae", "specimen histological staging"

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