Bạn tham khảo nha!
Dear Mom and Dad!
Ever since I came here, I miss you two every day. I can just call Messenger for you, but that's all I can do to meet people.
My job is still fine, I earn a lot of money a month to cover my life, I just know to thank everyone from the bottom of my heart. Thinking of my parents every day, for everyone I will do everything to make my parents filial.
I met wonderful people who helped me. In addition, I also met Mr. Tuan, the director of the subsidiary. He has helped me a lot, from the nature of work, to the way of writing. I feel grateful to him, thanks to him I succeeded. 
However, parents are most important to me, please wait for me, I will return to Vietnam. The person I want to meet first is 2 people and will hold a tight and long hug. Well, the article has been long, I wish my parents a lot of health and happiness.
Son of your parents
Dat