If you already have a bachelor's degree you would only qualify for the lifetime learning credit. It has income limits you can find in the IRS pub 529, but will essentially get you back 20% as a nonrefundable credit up to $10k in expenses.
If you live in a state with deductible 529 plan contributions & plan to pay for the courses in cash, another option is to funnel money through one for the state write off, then use it right away for the expenses. That varies a lot by state because they each have their own rules on how much you can deduct and how long you have to "season" the money, but I was able to do this successfully in IL a few years back.
