this is my code..........
<record id="view_candf_search" model="ir.ui.view">
<field name="name">kv.attendance.search</field>
<field name="model">kv.attendance</field>
<field name="arch" type="xml">
<search string="Search Here">
<field name="truck_id" string="Truck"/>
<group expand="0" string="Group By...">
<filter string="Date" icon="terp-personal" domain="[]" context="{'group_by':'date'}"/>
<filter string="Truck" icon="terp-personal" domain="[]" context="{'group_by':'truck_id'}"/>
<!-- <filter string="Coach" icon="terp-personal" domain="[]"/>-->
</group>
<field name="truck_id" string="Truck"/>
</search>
</field>
</record>