三顾茅庐/ 三顧茅廬 sāngùmáolú to earnestly request someone's services
To make earnest and repeated requests for someone to take up a post or help with a cause; literally "to visit the thatched cottage three times," based on the story of 刘备 liúbèi recruiting 诸葛亮 zhūgěliàng in the 三国演义 sānguóyǎnyì.