Chứng chỉ Word - MOS file:///C:/Users/tieng/Downloads/Office%20Word%202016.pdf Chứng chỉ PowerPoint - MOS file:///C:/Users/tieng/Downloads/Office%20PowerPoint%202016.pdf Chứng chỉ Excel - MOS file:///C:/Users/tieng/Downloads/Office%20Excel%202016.pdf