In what way we can connect the following two sentences.
He couldn’t get money from the bank.
He couldn’t buy a house.

''So'' makes a subordinating link between the cause/reason (He couldn’t get money from the bank) and the result (he couldn’t buy a house). This is a grammatical link. The position of so cannot change.
''As a result'' creates a link between two clauses based on meaning. We can move as a result.
He couldn’t get money from the bank. As a result he couldn’t buy a house.
He couldn’t get money from the bank. He couldn’t buy a house as a result.