I am writing to apply for the position of Sales Manager that you advertised in the Webside in www.thaitechno.net of December 8.
I have a Diploma General Management. I also have some useful experience from my summer internship at the Document, Nano Mirror Industry Co., Ltd. I am enclosing my resume to emphasize my suitability for the post.
I look forward to meeting you and discussing the position with you. I will be available for an interview at your convenience.