Perhaps you should try some spelling variations:
"mail's aggressive disorders" » "mail's depressive disorders", "mail's depressive disorder", "mail's recessive disorders", "male aggressive disorders", "animal's aggressive disorders", "various aggressive disorders"
"mail's impressive disorder" » "mail's depressive disorder", "mail's depressive disorders", "mail's depression disorder", "build impressive disorder"

Try widening your search to All Fields.

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