Perhaps you should try some spelling variations:
"treatise aggressive disorders" » "treatise depressive disorders", "treatise recessive disorders", "treatise aggressive diseases", "treating aggressive disorders", "hepatis aggressive disorders", "rates aggressive disorders"
"mail's depressive disorder" » "mail's impressive disorder", "mild depressive disorder", "manisch depressive disorder"

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: (("mail's depressive disorder") OR ("treatise aggressive disorders"))*.
• Removing quotes may allow a broader search: (( mail's depressive disorder ) or ( treatise aggressive disorders ))*.