Baidu runs China's primary search engine, but with the PC search business maturing and the economy slowing, Chairman Robin Li has been looking to diversify. In the past two years, he's pushed Baidu deeper into the kinds of e-commerce businesses dominated by China's other two big Internet companies, Alibaba and Tencent. During that time, Baidu's invested almost $1 billion in more than a dozen websites and apps specialising in everything from food delivery to laundry pickup, from booking a doctor's appointment to reserving a slot at a karaoke club. The goal is ...