Interested in Language
I would be grateful if you would suggest which one is the better to speak ?
1. I am looking for a job.
2. I am on the lookout for a job.
3. I am searching for a job.
4. I am hunting for a job.
You will also hear "I'm job-hunting". Note that that construction doesn't work with your other examples (ie, we don't say "I'm job looking" or "I'm job searching".) You might hear "I'm a job-seeker". One of the financial benefits paid by the British government to unemployed people is called "Jobseeker's Allowance".
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.