First, I need to understand what "Dinh Muc 203 QD-EVN" refers to. In Vietnamese, "Dinh muc" translates to "standard" or "regulation". So, it's likely a directive or regulation from EVN with the number 203. The "QD" prefix probably stands for "Quyet dinh", which means a directive or decision from a higher authority. QD-EVN would then be EVN's specific directive number 203.