The search results are quite restrictively selected, that is what I realise myself. But When buying / downloading books, your book is going to be recomended by 'similar books' or 'other users bought' recomendations. What we learn out of helpful books like 'diary of a newbie e-book author' is that most authors are not (yet) polular as JK Rowling and EL James. You have to work on your advertisement very hard to get back your money you have invested.
I waited to get feedback about the issue from iTunes, but I did not get a response. Sorry for delay answering your question, but I waited for a while...
The book has the Bisac category "Europe" and the title "Declaration of love to Europe".
But it is not listed in the search result of "europe" at all.
Even if there are hundreds of books, many of them quite far away from the topic "Europe". This looks like being ranked on the lowest level by iTunes, keeping it out of sight of customers. I have this problem only with english books, in other stores than my "home"-store. Is it a kind of protection for the US.market?
Since all my books are produced with Iba, and for iTunes only, this is quite frustrating.
"...Europe" is a picture book, made with love and professional photos, not a big book, but ceratainly a nice booklet or magazine, with a very reasonable price (4,99$). And there are more books withe the same problem, even more elaborate ones.
Now I did set the price to zero. Actually I try to take it out completely form the paid store, and republish it in the free section.