This is a well known thing amoung veteran UFT users.
When you select "Find" you only get 250 items. This is due to a problem that UFT had when trying to search large data bases for an item and the process would lock up and you would get an abend of UFT and have to completely restart the computer to restore UFT.
They came up with this fix. If the item you are looking for is in the 250 range, you do get the item right away. If not there is a box at the top of the results that you get to reenter the item you are searching for (or the first part of the item) and click on the "Search Again" radio button next to this field.