Default [Q] stock email app

I dont understand the stock email app i go to link my yahoo account too it once linked it loads 30 odd messages but i wont let me search for older messages on a server say i search for a email from my dad from aboug .2 months ago the search does not pull anhthing up and if i go to the bottom of the messages that have beenoaded it will not load or let me view anymore thab the 30 odd loaded