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"
"specimen histological slavicae" » "specimen pathological slavicae", "special histologic slavicae", "aspects histological slavicae", "specimen histological slices", "specimen philologica slavicae", "specimen histological staging"
"specimina philologiae slavicae" » "specimina philologica slavicae", "specimen philosophiae slavicae", "specimina philologica slavica"
"specimina philologie slave" » "specimina philologica 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 ("specimen histological slavicae"))) OR ((("specimina philologiae slavicae") OR ("specimina philologie slave")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"specimens philological slavicae\") or (\"specimen histological slavicae\"))) or (((\"specimina philologiae slavicae\") OR (\"specimina philologie slave\"))))".
• Removing quotes may allow a broader search: (((( specimens philological slavicae ) or ( specimen histological slavicae ))) or ((( specimina philologiae slavicae ) OR ( specimina philologie slave )))).
• Adding a wildcard symbol may retrieve word variants: (((("specimens philological slavicae") or ("specimen histological slavicae"))) or ((("specimina philologiae slavicae") OR ("specimina philologie slave"))))*.