Vietnam's benchmark VN Index edged up in mixed trade on Friday, posting the first weekly gain in nearly one month. Dairy products maker Vinamilk, the country's top firm by market value, outperformed the market, rallying 1.42 percent, with its relative strength index (RSI) over 70, slightly above the over-bought level. The stock index rose 0.13 percent and gained a combined 2.5 percent this week, the strongest weekly gain since late January, after being Southeast Asia's worst performer in the first quarter of 2016, Reuters data showed.