This is where is gets really confusing, so bear with me… The Mystic Nine, which you can’t find on Viki, is actually the prequel to The Lost Tomb, which you can find on Viki. The Mystic Nice Tetralogy, also on Viki, is actually a spin-off, a side story to The Mystic Nine, focusing on the origins of the four main protagonists. There is also supposed to be a second season to The Lost Tomb, but there is so much mystery behind the series that it really is difficult to make heads or tails of it…
Others are much more knowledgeable, so if you want to know more, go here:
https://discussions.viki.com/t/the-lost-tomb-season-2/15973