Barefoot and muddied, a group of youngsters sprint across a makeshift pitch in rural Vietnam, passing the ball in a game of touch rugby in a country where few people have ever heard of the sport.They belong to Vietnam's only rugby programme for locals, rolled out for kids in a remote commune where some players have to travel by boat to training sessions often held against a backdrop of rice terraces and curious onlookers. Few knew anything about rugby when they joined the scheme