Ok, now getting close to solve this. 
When I created connevtion with py file and used:
conn = psycopg2.connect(**params)
cur = conn.cursor()
conn.set_client_encoding(‘UTF8’)
It will work.
So how can I set this conn.set_client_encoding(‘UTF8’) when using
Connect To Database
https://franz-see.github.io/Robotframework-Database-Library/api/0.5/DatabaseLibrary.html