While there is no way that will do this totally successfully, by inverting the phase of one channel you can normally reduce the vocal by 6dB which is often enough to allow you to add another mono vocal track that will mask the original.
Or you could consider buying a Karoake version of the music.
hi, could you please explain a bit more of how to invert the phase of one channel? Im trying to remove or at least reduce as you said the voice and leave the music and sound effects in order to add a different voice on top. thanks in advance!