Hi all. There are some problems with the search engine K2.
I have an article with some such name "MMK-02M." Three letters, dashes, three letters. The minimum number of characters for a normal search on the server is registered "ft_min_word_len=4". This variable can not be changed.
Now, as I understand it, when entered in the search bar "MMK-02M", the search engine ignores dash, and splits the query into two words "MMK" and "02M", and looking at each word separately. Accordingly, the search is not performed. There are no results, although such an article exists.

How to fix the code so that search engines did not miss a dash?
OR
Give tips that I do.

Thanks.