I found a similar to mine problem described here (but it was written several years ago, so I hope there might be some clue by now…): http://omeka.org/forums-legacy/topic/search-problems.
If I have a publication with some several words keyword (for example: “beautiful summer”), neither the front page Search for Keywords, nor Search by Tags (http://www.XXXXX.com/items/search) would find that publication if searching only by one of these two above words (eg. search by “beautiful”, or search by “summer”; no results).
What’s interesting, the simple search (top-right) field in the admin panel works properly (displays the above publication as the search results after typing only one word of the 2-words keyword). But the advanced search still displays nothing…
I also would like to add, that none of the words from the keywords is used in the item title or description.
Do you see any idea, how to make the system search properly? Or maybe I shoud create the keywords in a different way (for example when adding multiple words keyword, also add each single word as another keywords; but this would be weird for users and admins).