please review the link below
https://turbotax.intuit.com/tax-tips/college-and-education/take-advantage-of-two-education-tax-credi...
there is an income phase out which is why you may not have captured either one of the two credits noted in the link. (you didn't note whether you are single or married as the phaseouts are different for each case)
did TT capture the $500 Other Dependents Credit (child must be under 24 if full time student but over the age of 16); there are other requirements but just answer the questions in TT to determine eligibility.
Also, for itemization, just answer the questions in TT; if filing married joint, the standard deduction is $24,000 ($18k if head of household, $12k if single), so no sense capturing the itemized deductions if your totals are less than that (and state and local taxes are limited to $10k).
lastly, as noted in other parts of this thread, historically about 75% of tax filers received a refund. Separate from the tax law change, the withholding files from the IRS to employers were adjusted so that the expectation was that far less than 75% will receive a refund (and of course that means a higher percent will owe). From the comments in this thread, that appears to be playing out - you are not alone.
Look at the bottom of the '5 year history' in TT (it's in the Desktop version, not sure about online) and it will show the percentage of tax liability against gross income, and it validates whether there is a benefit or not from the tax law changes.... the separate conversation is whether your employer withheld enough or not resulting in no refund on April 15 - it's two separate conversations.
