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

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"lungs / diseases, instructive\") OR (\"lungs / disease, instructive\"))*".
• Removing quotes may allow a broader search: (( lungs / diseases, instructive ) OR ( lungs / disease, instructive ))*.