miễn nhiễm 
unpolluted, immune [ miễn ] : (1) exempt (from taxes, e.g.); to forgive, excuse; (2) on condition, provided that; (3) reluctant
[ nhiễm ] : to be infected, catch, contract (an illness)
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
hệ thống miễn nhiễm immune system