You have to add a new record to your view having a search tag.

<record model="ir.ui.view" id="projects_search">
            <field name="name">Projects</field>
            <field name="model">blub.projects</field>
            <field name="type">search</field>
            <field name="arch" type="xml">
            <search string="Search project">
                <field name="description" string="Description" />
           </search>
        </field>
    </record>

You can also add filter with tag

                <filter name="draft" string="Draft" domain="[('state','=','draft')]" help="Draft Projects"/>

And grouping with :

                <group expand="0" string="Group By...">
                    <filter string="Partner" domain="[]" context="{'group_by':'partner_id'}"/>
                </group>

Best regards,

Cyril