Many young football teams suffer from a lack of qualified coaching.

coaching 是动词 coach 的现在分词形式。coach 作为动词时意思是"指导、训练"，指对运动员或团队进行专业指导和训练。 qualified 是形容词，意思是"合格的、有资质的"，指具备必要的技能、知识或资格。 qualified coaching 指的是"由具备专业资质的教练提供的指导训练"。