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

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