Odoo-Tutorial/cenhomes_student/views/template_common.xml

<odoo>
    <data>
        <template id="page_404">
            <t t-name="page_404">
                <t t-call="web.frontend_layout">
                    <div id="wrap">
                        <div class="container">
                            <h1 class="mt-5">Không tìm thấy trang!</h1>
                        </div>
                    </div>
                </t>
            </t>
        </template>
    </data>
</odoo>