kể từ sau 
since (something happened) [ kể ] : (1) to include; (2) to list, mention, declare, consider; to relate, tell (a story); (3) individual, person
[ từ ] : from, since, of; to leave; to turn down; word, expression, vocabulary; temple guard; to renounce, give up
[ sau ] : again; next; after, behind, afterwards
Most Common Compounds Set 1:
Most Common Compounds Set 2 :