Perhaps you should try some spelling variations:
"lungs / diseases, instructive" » "lung / diseases, instructive", "lungs / diseases, constructive", "lungs / diseases, destructive", "lungs / diseases, instructions"
"lungs / disease, instruction" » "lung / disease, instruction", "lungs / disease, instructions", "lungs / disease, construction"

Try widening your search to All Fields.

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• If you are trying to use Boolean operators, they must be ALL CAPS: (("lungs / diseases, instructive") OR ("lungs / disease, instruction")).
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