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

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