trong ngót nửa thế kỷ 
for almost half a century [ trong ] : during; in(side), among
[ ngót ] : (1) almost, close to, nearly; (2) to diminish, decrease, become more compact
[ nửa ] : additional, further, more; half
[ thế ] : (1) manner, way, fashion, position, situation, posture; (2) so, thus, like that, such
[ kỷ ] : (1) order, discipline; (2) small table, bench; (3) self; (4) to write, record; (5) cycle, era; (6) 6th cycle of the twelve years of the Chinese zodiac
Most Common Compounds Set 1:
Most Common Compounds Set 2 :