Hi there,
Thank you very much for your answer. I do need search on download category and tags so I was surfing on the net a little bit and found solution. See this link https://designcrumbs.ticksy.com/article/4036/ it helped me, so my search is now working on categories and tags as I need it. Hope this can help some of yours other users, it helped me 🙂
Thanks a lot,
Best regards,
Sasha