so that
in order that
For the purpose that. So that is usually followed by can or could; in order that is usually followed by may or might.
Let's get ready now so that we can leave when Father comes.
Betty saved her money in order that she might buy a doll.
With the result that; so.
My pencil fell under my desk, so that I couldn't see it.
George often told stories that weren't true, so that no one believed him when he told about a deer in the school yard.