Sit your patient bolt upright and see if cough is anymore effective. You could try Yankauer to back of throat in case its just secretions caught there. Otherwise get someone to show you how to suction nasally and consider putting in a nasopharangeal airway if you are going to have to do it repeatedly (causes less trauma). Also get your patient onto a facemask with humidified oxygen and check they are on regular nebulisers to loosen secretions. Hope this helps!!