How to make the search on the server side work like the default datatables search

lsparedes

Dear, I am doing the server-side search as explained in the official documentation, but I have the problem that the search is now not as accurate as before implementing this. I explain, before the order did not matter, it did not matter to write the words complete or be so explicit, now I only find the coincidences completely accurate. This has caused problems for weeks and I still can not solve it.
I hope you can help me or guide me on how to make my search more accurate.
Thank you.