In openerp 7 i have more than 2000 patient records in search box entered letter 'a' its shows all the record how to set minimum limit to search record which method need to override in Openerp 7 version?
<record id="view_intake_filter" model="ir.ui.view">
<field name="name">intake.filter</field>
<field name="model">patinet.form</field>
<field name="type">search</field>
<field name="arch" type="xml">
<search string="patient Intake">
<field name="patient_id"/>
</search>
</field>
</record>