Google (GOOG.NASDAQ) has added a new service to its Chinese site which aggregates group-purchase deals in the mainland, Bloomberg reported. The new program, dubbed “Shihui,” or “timely benefit,” collects group-buying discount deals provided by over 100 partner sites, including Groupon’s China venture and competitors such as Lashou, Manzuo and Tuanbaowang. “Shihui is in the early stages of development and we’ll be working closely with out partners to see what features drive the best traffic to their sites and help users find the offers that are most valuable to them,” said a spokesperson for the company. Google has been struggling to maintain market share in China since a public falling-out with authorities in early 2010 over its refusal to censor search results. The internet giant’s share in China’s search market has fallen from 36% in late 2009 to just 19% in the second quarter of 2011.