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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"mail's depressive disorder\") OR (\"treatise aggressive disorders\"))".
• Removing quotes may allow a broader search: (( mail's depressive disorder ) OR ( treatise aggressive disorders )).
• Adding a wildcard symbol may retrieve word variants: (("mail's depressive disorder") OR ("treatise aggressive disorders"))*.