Perhaps you should try some spelling variations:
"Biological effects of electrodiagnostic studies" » "Biological effects of electrodiagnostic testing"
"biological effects of electromagnetics session" » "biological effects of electromagnetism session", "biological effects of electromagnetic version", "biological effects of electromagnetics design"
"Biological effects of electromagnetic studies" » "Biological effects of electromagnetic sources", "Biological effects of electromagnetic sounding", "Biological effects of electromagnetic source"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((("Biological effects of electromagnetic studies") OR ("Biological effects of electrodiagnostic studies"))) OR ("biological effects of electromagnetics session")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"Biological effects of electromagnetic studies\") OR (\"Biological effects of electrodiagnostic studies\"))) or (\"biological effects of electromagnetics session\"))".
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• Adding a wildcard symbol may retrieve word variants: (((("Biological effects of electromagnetic studies") OR ("Biological effects of electrodiagnostic studies"))) or ("biological effects of electromagnetics session"))*.