A simple handshake between President Xi Jinping and once-shunned entrepreneur Jack Ma sent Chinese tech stocks booming in recent weeks as it was interpreted as the latest sign the sector is being brought in from the cold—though experts advise caution.A simple handshake between President Xi Jinping and once-shunned entrepreneur Jack Ma sent Chinese tech stocks booming in recent weeks as it was interpreted as the latest sign the sector is being brought in from the cold—though experts advise caution.Business[#item_full_content]