Unfortunately there is not currently any way to change how the search functionality works. However, it does work differently depending on what you are searching for. For example, when searching for people you can use first name, last name, email or usernames to get results.
If you would like improvements to searching to be added in the Okta catalog, you can create a feature request in our community forums. You can do this by accessing https://support.okta.com/help/oktaideas and using the green button "Post idea" on the right. Features suggested in our community are reviewed and can be voted and commented on by other members of the community, therefore making it much easier for the engineering team to understand the priorities that you have for feature requests. From there, the PM team will review the top 30 most voted upon ideas each month and provide feedback/roadmap status on these via the forum.