I searched the web for the complete lyrics of the song "必须要耐心说服她（《送货路上》方秀春、小兰唱段）" by 方秀春 and 小兰, but I could not find any relevant results. It seems that this song is not very popular or widely available online. Maybe you can try to contact the singers or the producers of the show "送货路上" to get the lyrics. Sorry for the inconvenience. ?