Ok I asked my husband to correct your letter because he is better at writing formal letters, I hope it helps:

Dear Ms. Ho Thi Ngoc Ha, 

Renesas Design Vietnam Co, have often presented interesting seminars at my university. In fact, whenever RDVC conducts a seminar at University of Technology, I regularly attend. It has been some time since I have considered RDVC the ideal company for a post graduate at UT to work. The status RDVC holds as a large scale leader in chip design and bleeding edge technological relations inspires me with the will to be part of their workforce.

As an individual from a technological background, RDVC would provide what I believe to be the perfect blend of hands on industry training along with the boon of attaining real-world work experience. Previously, I have worked as an intern at Silicon Design Solutions; Vietnam, for five months. I accumulated a large amount of experience in electronics and chip designing there, skills I believe RDVC could benefit from.

All in all, I believe that offering me a place for this position at RVDC would not only benefit myself, but provide RDVC with a bright-eyed, keen and relatively experienced individual. I am self motivated, work well within a team, and have a positive attitude to anything I undertake. Attached is my resume and score transcript. Thank you for your time and consideration.

Yours Sincerely,
Tran Thi Ai