Hi Luanvanviet,
As mentioned in the update, the attachment is not available to check the error screenshot. Please share us the error screenshot to validate the issue. Also share us the 'syncfusion-javascript' version you have installed in your angular application and also the version of Syncfusion assemblies referred in Asp.Net Core application. This information will be helpful to assist you further.
Regards,
Mageshyadav.M