Specific search macros

Hello, I used to use Microsoft Access. Recently, I switched to LibreOffice, but the problem is that I don’t know anything about LibreOffice macros. (In Access, the macros and buttons were predefined).
I would like to know how to create macros in the LibreOffice database that search for specific text in a given field.

Let me explain:
I have a form with several records (from a query) containing various fields (see image No. 1), including a ‘COUNTRY’ field and a ‘SUPPORT’ field. I would like to create different buttons that will search the ‘COUNTRY’ field for the text FRA for the first button, the text DEU for the second button, the text ESP for the third button, etc. And another series of buttons that searches the ‘SUPPORT’ field for the text CD for one button, the text LP for another button, the text CDm for another…

For your information, I definitely do not want to create a filter, just a search for specific text in a specific field.

Image N °1