IPad search mail on exchange 2013

Device: IPad Air 2/ios 8.1.3

Exchange Server 2013

Hi All,

I am facing a problem of searching emails on the Exchange Server 2013.

I have configured the mail app, synchronizes 1 week with the server.

When I perform a search in the inbox, I understand that it is searching only the 1 week cache in the device. But I recalled there is an option which I can continue the search on the Server even if the mail is not cache in my device.

Need some help here, thank you.

Best Regards