I share my experience here: https://aseannow.com/topic/1224885-ordering-a-lenovo-thinkpad-4-weeks/page/3/
in short, @blackcab is right - the import duty is random here, most likely you will be required to pay VAT 7%, and less probably but still possible you will be required to pay extra 10% import tax for "electronics". If you are lucky you will pay nothing.