HANOVER — Volkswagen (VW) said it would try to find a new chairman quickly and announced a long-planned tie-up of its truck brands, seeking to return the focus to business following the carmaker's shock ouster of former patriarch Ferdinand Piech.CE Martin Winterkorn, who survived the public showdown that triggered Mr Piech's resignation last month, told shareholders on Tuesday the group would tackle the trouble spots that Mr Piech complained about in provoking the leadership crisis."It is good that we have returned to calmer waters and that we have clarity about our future direction," Mr Winterkorn said at VW's annual shareholder meeting."We cannot and must not stand still."VW, Europe's biggest carmaker, is cutting costs at its namesake car brand in a bid to improve profitability, while also battling to revive its fortunes in North America and build a trucks business to challenge sector leader Daimler.Mr Piech, who retains a stake in VW and has clashed with the group about board app...