Searching problem in iOS

hello,
i use 1password 4 with a mac and sync it via dropbox. i also using the iOS app and all works fine, but i have a little problem. Because i have a lot of items in the 1P-database i often use the search function. i add custom fields in some entries. On my mac the search works fine ( it shows all items which contains the specific search-text after i click the button "expand search to all fields"). But in the ios app it doesnt show all items although i "expand the search too all field" too. Especially the custom fields are not displayed in search. i try it with lower case and upper case. Maybe the search-engine in the real osx application is more powerful than the ios version?