Chinese internet giants are working hard to regain support from authorities and global investors after struggling to sell their shares this summer. Pinduoduo Inc, a leading online retailer in China. And JD.com Inc. Share surged by more than 20% this week after reporting strong sales growth in the second quarter, regaining most of the big losses since July. He emphasized their contribution to Chinese society. Their work has taken some of the focus from Beijing’s expanding regulatory crackdown, which has kept many investors away from the once hot Internet sector. Pinduoduo, a fast-growing e-commerce player known for selling vegetables, groceries…