The Vietnam Shipping Magento Extension allows online stores in Vietnam to add three shipping methods based on the customer's location and package weight. It manages customer addresses by area, province, and district using dropdowns. Shipping costs can be calculated flexibly according to rules based on the customer's location. The extension includes normal, express, and free shipping options and shipping rules to provide discounts or free shipping under certain conditions. It also includes a shipping weight table to calculate express shipping costs based on package weight.