Tim Kảraoke DVD Ripper softwares that can..

I have many Kảraoke DVDs (and most of them either have same songs or may have 1 or 2 songs that I can't recognize) and would like to combine and convert into 1 DVD or VCD that can play on regular DVD player. Móst DVD rippers do good job ripping individual tracks but don't have option to tủrn off Vocal (singer singing). Can anyone help to provide information or softwares how to do that? I am looking something to convert to VCD just like Nhac Karaoke (Minh Tuyet collection ) you see in the forum. Thanks.