gần cả tháng 
almost (an entire) month [ gần ] : near, close to (place, time)
[ cả ] : (1) oldest, biggest; old; (2) both, everyone, all (of), entire, whole; (3) even, also, as well; (4) at all
[ tháng ] : month
Most Common Compounds Set 1:
Most Common Compounds Set 2 :