Thanks for reaching out! While we don't currently have a search function for email campaigns we are submitting customer feedback to our programmers for this feature request. At this time you can sort your email campaigns by: Last Modified, A - Z, Z - A, Old - New, or New - Old. Just click the Campaigns tab, click the dropdown for Campaign Type and select Emails. Then you'll see the option to sort your email campaigns how you'd like:
Another option is to utilize campaign folders. You can event create up to two additional levels of sub-folders in each top-level folder to keep your campaigns organized and easy to find!