Can you help me find out why haven't gotten my tax return?

How long has it been since you filed?

You should first make sure your return was successfully filed.   

How did you file? Did you efile, or did you choose to print, sign, date, and mail a paper return?    If you chose to mail a paper return, did you physically mail it yourself? TurboTax does not mail it for you.

If you efiled, double-check to be sure the return was efiled successfully and accepted.
After efiling, did you get any email saying it was submitted, and a later one saying it was accepted?

         Confirm the status.   If you used Online TurboTax, sign into your Online Account and check the efile status at the Tax Home.   If you prepared it online, what is shown there?  Does it show the status of the return as accepted, rejected, printed, started, ready to mail, or something else?

If you used desktop software, you can check from within the software.

If that showed that your efiled return was indeed accepted, (or if you printed and mailed a paper return), you can use the "Where's My Refund" tool at the IRS website below to monitor the status of your Federal refund. 

https://www.irs.gov/wheres-my-refund

Here are some tips when using the IRS "Where's My Refund" tool if it's not finding your information:

• Be sure you enter the correct tax year, SSN and filing status.
• Be sure you are using only the Federal refund amount.   Do not include any state refund or any total refund or net refund (Fed and State) that TurboTax may have provided on a summary screen.  
• Look at your actual Federal return to get the Federal refund amount, i.e., your Form 1040, Line 35a.

FAQ:  How do I track my state refund?

https://ttlc.intuit.com/community/refund-status/help/how-do-i-track-my-state-refund/00/25571