giám định viên 
expert [ định ] : to intend, plan, fix, determine, ascertain
[ viên ] : (1) [CL for for officials, officers]; (2) [CL for round objects, bullets]; (3) member
Most Common Compounds Set 1:
chuyên gia Most Common Compounds Set 2 :
Experts say that it doesn't follow the market rules for the government to restrict housing prices. 
Experten sagen, dass die staatlichen Beschränkungen der Immobilienpreise nicht mit den Marktregeln vereinbar sind.