Hanoi, Oct. 22 -- The state visit to Bulgaria by Party General Secretary To Lam is expected to open up new cooperation opportunities in trade and investment through greater market access for both sides, while helping the two countries strengthen a solid and trustworthy bridge linking Bulgaria with ASEAN and Vietnam with the EU. Complementary relations According to trade experts, Bulgaria was among the first countries in the world to establish diplomatic relations with Vietnam. The two sides have regularly maintained delegation exchanges at various levels, including high-level contacts, and have held periodic bilateral cooperation mechanisms. They have also cooperated and supported each other at multilateral forums such as the United Natio...