Cambodia PM visit to bolster close ties   Cambodian PM Hun Sen visits Viet Nam today. - VNA/VNS File Photo HA NOI (VNS)- Cambodian Prime Minister Hun Sen begins a three-day official visit to Viet Nam today. The visit, made at the invitation of Vietnamese PM Nguyen Tan Dung, is expected to further strengthen traditionally close relations that the two countries have enjoyed for decades, especially to enhance long-standing bilateral co-operation in many fields, including trade and investment. Viet Nam is the first country that Hun Sen is visiting after his re-election as Cambodian Prime Minister. The two government leaders will also exchange views on issues of common concern. Viet Nam and Cambodia established diplomatic ties in 1967. Since then, bilateral trade ties have increased steadily, with two-way trade turnover reaching US$3.3 billion in 2012. In the first 10 months of this year, the figure hit $2.94 billion, an 8 per cent increase in comparison with the same period last year. Viet Nam has invested in 126 projects in Cambodia with a total capital of $3 billion, focusing on cultivation of industrial crops, mineral exploitation, oil and gas exploitation, telecommunication, finance and banking. Bilateral co-operation in science, education and training, healthcare and tourism has also developed strongly in recent years. - VNS