VIETNAMESE traders will open a five-day products exhibition in Phnom Penh April 7, seeking to boost bilateral trade with Cambodia after a drop in 2009. The “high-quality products” exhibition, to be held at Mondial Centre, expects 200 companies and 300 booths, continuing a biannual convention that began in 2002, Le Bien Cuong, Vietnam’s Commercial Counselor in Phnom Penh, said Tuesday.