For Product Searches - Top Selling Products, Top Searched Products, Revenue Distributions, Orders, Audit Logs, Bulk Redelivery History, Listing Enhancement Performance
For Buyer/Customer Searches - Orders
For Manager Searches - Audit Logs
For Collaborator Searches - Revenue Distributions
All of the above could use a "Search" option to make things more faster and simpler for the store owner or manager.
Simply because sifting through 20 or so products per page within a store that might have a few hundred or a few thousand items is not feasible. There might be other pages that could use the "Search" option but the above are helpful suggestions on where to start.
Though "Top Selling Products" and "Top Searched Products" would be subjectively the most important.