Perhaps you should try some spelling variations:
"major depressive disorders" » "major depressive disorder"
"major depression disorder" » "major depressive disorder", "major deposition disorders"
"major intensive disorder" » "major intestine disorder", "major intestine disorders", "major intrinsic disorder", "labor intensive disorder", "labour intensive disorder", "major invasive disorder"

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: (((("major intensive disorder") OR ("major depression disorder"))) OR ("major depressive disorders")).
• Removing quotes may allow a broader search: (((( major intensive disorder ) or ( major depression disorder ))) or ( major depressive disorders )).
• Adding a wildcard symbol may retrieve word variants: (((("major intensive disorder") or ("major depression disorder"))) or ("major depressive disorders"))*.