mãi đến lúc ấy 
until that moment, not before that moment [ mãi ] : (for) a long time, always for ever, for good, unceasingly, continually; to continue, go on
[ đến ] : from, beginning; to come, arrive; to, until, up to
[ lúc ] : moment, instant, time; when, at the moment that
[ ấy ] : that, those
Most Common Compounds Set 1:
Most Common Compounds Set 2 :