liên lạc 
communication, contact, liaison, get in contact, connect, communicate [ liên ] : (1) union, connection; (2) successive, following
[ lạc ] : peanuts; to be lost, go astray, lose one’s way
Most Common Compounds Set 1:
liên lạc Most Common Compounds Set 2 :
liên lạc Hãy giữ liên lạc .
liên lạc báo chí spokesperson liên lạc viên liaison man liên lạc với nhau to communicate with each other an ninh hệ thống liên lạc traffic security bắt liên lạc establish liaison, contact, link up, communications mở những liên lạc to open communications sĩ quan liên lạc liaison officer sự liên lạc communication, contact đường liên lạc communication route |
After graduating, we rarely contacted each other. 
Nach dem Abschluss hatten wir kaum Kontakt zueinander.