How can I get my 2019 return because I been filing with turbotax last few years and in my documents my 2019 return isn't in their

many taxpayers have multiple a/c's. it's likely your not in the same a/c used for 2019

Navigate to the TurboTax account recovery page
Enter your phone number, email address, or user ID. The most recommended is the phone number since it is secure and easy to access
Once you have entered the correct email, user ID, or phone number, start following the on-screen directions that appear, you will be guided step-by-step until you recover your account successfully.

https://myturbotax.intuit.com/account-recovery/ 

To access a prior year return return with TurboTax, you want to make sure you are using the same TurboTax account as in prior years. If that still does not work for you, you can order a tax transcript from the IRS using the link provided below: 

Welcome to get transcript