I thought that you are using Joomla! search, not K2 search.

K2 does not have options for searching "All words" or "Any words". if you want to search for an exact phrase you can use quotes in your search. There is no option to search for any word in K2 search.

Can you clarify where have you added the image description as you wrote?

In fact, I am doing a website that will act as GOOGLE IMAGES. So I have several picture and we can do a search in these images from defined tags on each.
for now I use K2 images and with K2 search, I managed just to do the research on the images but only with a single criterion. When I put two, it finds nothing.
Thank you to tell me how I can get the income GOOGLE IMAGE.