Chinese ecommerce giant Alibaba and mobile developer UCWeb today announced their latest joint venture: mobile content search. The two companies have created a mobile search engine for apps, shopping, and ebooks, in addition to the more traditional search model. The development of Shen Ma actually began in July of last year. Sina Tech reports Alibaba owns 30 percent of the new search engine and UCWeb owns 70 percent. Last October, Alibaba invested US$50 million in US-based app search engine Quixey, showing company’s growing interest in mobile search.