chỉ hẹp 40 dậm 
only 40 miles wide (narrow) [ chỉ ] : (1) only; (2) to lead; (3) to point, indicate, show, point out; (4) thread
[ hẹp ] : narrow, tight
[ dậm ] : mile
Most Common Compounds Set 1:
Most Common Compounds Set 2 :
chỉ hẹp 40 dậm only 40 miles wide (narrow)