I don't think, the search form itself has a built-in reference to the "parent page".
But if you just want to reload the table data, you might be able to use the same technique the search form uses after a button click. After creating the search form, the table page registers a listener, see org.eclipse.scout.rt.client.ui.desktop.outline.pages.AbstractPageWithTable.attachToSearchFormInternal(), and waits for org.eclipse.scout.rt.client.ui.form.FormEvent.TYPE_STORE_AFTER events. Therefore I guess you could fire a store event (e.g. by calling org.eclipse.scout.rt.client.ui.form.IForm.doOk() on the search form) and hopefully the table page will reload its data?