ChinaRock Capital Management has rewarded investors in its five-year-old venture capital fund with 27 times their initial outlays by scoring huge returns from financing start-ups involved in everything from artificial intelligence to ride sharing. The $37.5 million CRCM Opportunity fund has distributed more than $1 billion since it was set up in 2013, Toby Zhang, a venture capital partner of ChinaRock, said by telephone from San Francisco. An earlier venture capital fund returned more than $300 million.