VN-Index breaks below support on big volume. Vietnamese stocks fell for a fifth day, closing below a technical support level, amid the heaviest trading in three months. Large put-though trades with foreign investors at the end of the trading session helped push the market down 4.87 points, or 0.7%, to 651.31. VNM (-3.5%), which was the top contributor to the day's losses, saw record one-day volume by value with a massive trade just before the close.