There is a known course catalog Search function bug in eLMS. This bug prevents accurate search results when the search criteria includes parentheses around the Item ID, and/or the full Item Title is entered, and then the item is chosen from the drop down box when it appears.
The work around is to use ONLY the Item ID numbers in the search field and then click the Search icon or Go button. At that point, if the item is active and/or available for self-assignment, it will appear on the screen and contain the normal assignment options.