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

Try widening your search to All Fields.

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, instructive") OR ((("lungs / diseases, constructive") OR ("lungs / diseases, construction")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"lungs / diseases, instructive\") or (((\"lungs / diseases, constructive\") OR (\"lungs / diseases, construction\"))))".
• Removing quotes may allow a broader search: (( lungs / diseases, instructive ) or ((( lungs / diseases, constructive ) OR ( lungs / diseases, construction )))).
• Adding a wildcard symbol may retrieve word variants: (("lungs / diseases, instructive") or ((("lungs / diseases, constructive") OR ("lungs / diseases, construction"))))*.