Hi @Thai_Vo !
Yes, you can absolutely use fields from your database (like “Title” and “Content”) in the email subject and body — we do that too.
Whether the values show up correctly depends on your trigger setup. For example, if you’re using “Record Created” like in the 14-day email template, make sure you’re referencing the variables from the correct step. Here’s an example of the right variable path:
If you’ve changed the trigger or automation structure, a screenshot would really help. You can refer to this post for tips on debugging: 
❓ What to Do If Your Automation Fails in Bika.ai
We know variable setup can be confusing — we’re updating the docs soon to make this easier to follow. Let us know if you’d like help checking your setup!