If you cant find the lyrics in the search engine; call the radio station that plays the song and request information on who sings it.
If you find out who sings it, it is better to go from there.
Maybe its on youtube with them singing it, but it wont show up in the search, with just the title of the song.
Typing in the group name and then the song will gve you better results.
Then if youtube is the only form of the song you can get, you can transcribe the lyrics from the video.

This is the chorus:
Mission not impossible, with God all things are possible.
On his word I stand, hold the Master's hand.
Mission not impossible, miracles are possible.
Mission not impossible, with God.