Unpaired variants

Good day,
for some time now, after adding a new product from Aliexpress or when overriding an existing product, some variants from Aliexpress do not pair with the variant in Woocommerce (see attachment). I found out that these are Varinats that have č, š, ž, ó… simply a letter with a hook or a comma at the beginning of the name. And that is quite common in my language (Czech).

What should I do so that these variants are matched during import and I don’t have to do it manually?

Thanks for help.