Research on vocational education cooperation between China and Sudan Research on trade and investment cooperation between China and Poland 并列题名：Research on trade and investment cooperation between China and Poland Research on the path of regional economic cooperation between China and Central Asia Production capacity cooperation between china and nigeria 并列题名：Research on the path of regional economic cooperation between China and Central Asia Research on production capacity cooperation between China and other BRICS countries Research on regional education cooperation strategic among Beijing, Tianjin and Hebei 并列题名：Production capacity cooperation between china and nigeria Research on criminal juridical cooperation between Hangkong and mainland of China