For living vs For a living

Some examples from the web:

• All that for living in Portugal alone.
• To my only reason for living.
• This is like his whole reason for living.
• Linda was my reason for living.
• Or do some people have a greater talent for living than others.
• No one can blame me for living with my dear phantoms, but you, you must find the things from which other women make their happiness.
• A tonic for living on this earth.
• I flip houses for living now.
• Shep gave me a reason for living.
• Okay, I have a problem with Schuster what he does for living.
• Now I believe that and it's my reason for living.
• Destroying Friend is their reason for living.
• Good, it was... my reason for living.
• Good training for living in New York.
• The hero's only reason for living was to seek vengeance.
• And with it reason for living.
• And with it reason for living.
• She was my reason for living.
• Its enjoyment is an essential precondition for living together.'
• They're her reason for living.

Some examples from the web:

• Anders who lies for a living.
• So, tell me what you do for a living.
• I wonder what he does for a living.
• He details cars for a living.
• I make things up for a living.
• See, my old man drove a truck for a living.
• I could tell people what I did for a living.
• In other words, I work for a living.
• I make people angry for a living.
• Dude's like half pit-bull, and-and... and breaks rocks for a living.
• I do this for a living, too, girlie.
• I risk other people's money for a living.
• I know what it means to fight for a living.
• Well, I do hold guns for a living.
• Okay, I deliver babies for a living.
• What I do for a living... It's complicated.
• Antonio, for a living, had devised this occupation.
• You'll be cleaning out parking meters for a living.
• That he didn't repair TVs for a living.
• She publishes fictional novels for a living, Ziva.