có kỷ luật 
disciplined [ có ] : to be, have, exist; there is, there are
[ kỷ ] : (1) order, discipline; (2) small table, bench; (3) self; (4) to write, record; (5) cycle, era; (6) 6th cycle of the twelve years of the Chinese zodiac
[ luật ] : law, regulation, rule
Most Common Compounds Set 1:
nghiêm túc Most Common Compounds Set 2 :