eiru_product_search/product_search_view.xml

<?xml version="1.0" encoding="utf-8"?>
<openerp>
    <data>
        <record id="product_search_ref" model="ir.ui.view">
            <field name="name">product.search.refe</field>
            <field name="model">product.template</field>
            <field name="inherit_id" ref="product.product_template_search_view"/>
            <field name="arch" type="xml">
                <field name="name" position="before">
                    <field name="ean13" filter_domain="['|','|',('name','ilike',self),('ean13','ilike',self),('default_code','ilike',self)]" string="General"/>
                </field>
            </field>
        </record>
    </data>
</openerp>