“Vietnamese art remains a niche market globally but is surging in popularity at international auctions. In April, a late 1930s painting by one artist, Le Pho, sold for nearly $1.2 million at a Sotheby’s auction in Hong Kong, breaking the $844,000 record set by another of his paintings in 2014. But artists and dealers complain that the proliferation of fakes is dragging down the value of Vietnamese art.”