ประเทศไทย

^

The problem must have rooted in doing a direct translation from Google Translate.
I guess what you were actually trying to say was something like this....

Thailand

 I        miss     Thailand              and    haven't  been  there  for 5 years. How is it going?

ผม     คิดถึง    ประเทศไทย                   ไม่ได้ไปมา                5 ปี   แล้ว       เป็นอย่างไรบ้างนะ?

Miss (NOT miss as a 'title' as in นางสาว)

คิดถึง (Kid-tueng) means that you feel sad or nostalgia because of the absence of something

***ไม่ได้ไป sounds more 'right' if you would like to form a negative verb or action that took place in the past

Good luck with your Thai learning.