chất chỉ thị 
indicator [ chất ] : matter, material, substance, matter, agent
[ chỉ ] : (1) only; (2) to lead; (3) to point, indicate, show, point out; (4) thread
[ thị ] : (1) market, city; (2) to see; (3) to show, reveal, announce; (4) persimmon-like fruit
Most Common Compounds Set 1:
Most Common Compounds Set 2 :