If you still can't find the minus version of the songs, I recommend this site. On the site you can find songs, songs minus, the lyrics - all for karaoke lovers.
LINK 馃憠 xminus.me #link#useful#songs#minus
馃憠 @shoqon
Songs minus and text | Ecency
[#2] My workout today | Meu treino de hoje [ENG] [ESP] [POR]
@shoqon