đi sâu đi sát 
to keep in close touch with [ đi ] : to go; (particle used to form commands, suggestions)
[ sâu ] : (1) worm; (2) deep, profound
[ đi ] : to go; (particle used to form commands, suggestions)
[ sát ] : (1) to stay close to; close, tight; (2) to kill; (3) scratched, bruised; (4) to examine
Most Common Compounds Set 1:
Most Common Compounds Set 2 :