How to combine these authors?

I'm trying to combine these entries into one author:
* https://www.librarything.com/author/3787751865
* https://www.librarything.com/author/4165862365
* https://www.librarything.com/author/zatulovskayairina

I see a "Combine with..." heading in the sidebar but there are no suggestions and these authors don't appear in the search results.

How can I combine them?

Also, does the direction/order of combining matter?

Done.

'Combine with' only appears if the system automatically recognizes potential combination. In my years here, I've seen it propose a good combination only twice, mostly it proposes things to be dismissed.

I combined them by searching for Irina Zatulovskaya from author pages in Cyrillic. I think search only finds authors with some works already appearing at their page

Thanks. By the way, I found that authors can be combined directly by going to /authormerge.php?authors={id1}/{id2}. The first ID is considered the "main" record for the author.