Lehoangtn (25)
Teacher on TCEF. I'm teaching about telecommunication, switching system, broadband systems, skills, electronics, technology.
Viet Nam lehoangtn.blogspot.com Joined August 2018 Active 6 years ago
Teacher on TCEF. I'm teaching about telecommunication, switching system, broadband systems, skills, electronics, technology.
Viet Nam lehoangtn.blogspot.com Joined August 2018 Active 6 years ago