Hanoi, April 17 -- General Secretary of the Communist Party of Vietnam (CPV) Central Committee and State President To Lam and his spouse, together with a high-level Vietnamese delegation, left Nanning on April 17, successfully concluding their state visit to China from April 14-17 at the invitation of General Secretary of the Communist Party of China (CPC) Central Committee and President of China Xi Jinping and his spouse. Liu Jianchao, Secretary of the CPC Central Committee and Chairman of the CPC Central Committee's International Liaison Department, and Chen Gang, member of the CPC Central Committee, Secretary of the CPC Committee and Chairman of the Standing Committee of the People's Congress of the Guangxi Zhuang Autonomous Region, sa...