Used to be able to search a product by keyword... Why was this removed?

Within the Pre-Order app, you used to be able to search for a product by a keyword, or by one word within the title, and it would bring up a relevant list. For example, you could type in "Dress" and all products containing Dress in their title would appear. Now it only allows you to type in the exact title to pull up a specific product. Why was this changed?! It was so convenient before...