Does someone can write all main stock sites where keywords order is important for searching images? For example, I am submitting the same images on 9 sites, and I noticed that if I have "sand" and "heart" in my keywords, and if those words are in the end of keywords list, and if I type that in search form, in some sites I can't find my image, and on some sites I can find it easily.

If I am right, FT and StockXpert have that system. If you put important keywords in the end of the list, you will never find your image using search