nhằm lúc 
at the very moment, at the right instant [ nhằm ] : (1) in order to; mistakenly, incorrectly; on (a date); (2) to fall
[ lúc ] : moment, instant, time; when, at the moment that
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
nhằm lúc at the very moment, at the right instant