Cross the river with hay, cow and tiger

Ramu has a tiger, hay and a cow. He needs to cross the river. There is a small boat to cross the river, but the boat can only carry only 2 people at a time. i.e., it can either take Ramu + hay or Ramu + cow or Ramu + tiger. If Ramu is not present, cow will eat the hay. Also if Ramu is not there tiger will eat the cow. Help Ramu to cross the river with all 3.