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

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