chưa bao giờ 
never, not yet, not as of the present [ chưa ] : not yet, yet (to happen)
[ bao ] : (1) how much, many, so much, so many, some, any; (2) envelope, bag, pack, case, sleeve; to cover, enclose
[ giờ ] : time (of the clock), hour, o’clock; now is the time (for sth)
Most Common Compounds Set 1:
chưa bao giờ Most Common Compounds Set 2 :
Con người chưa bao giờ ngừng khám phá vũ trụ .
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I have been in Beijing for two years and haven't even been to the Great Wall yet. 
Ich bin seit zwei Jahren in Peking und war noch nie auf der Chinesischen Mauer.