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

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (("lungs / diseases, instruction") OR ("lung / diseases, constructive")).
• Removing quotes may allow a broader search: (( lungs / diseases, instruction ) or ( lung / diseases, constructive )).
• Adding a wildcard symbol may retrieve word variants: (("lungs / diseases, instruction") or ("lung / diseases, constructive"))*.