Use the Filter by name field above the table. Besides simple search, it accepts operators: the plus sign works as OR (black + white shows everything with either term) and the semicolon works as AND (black ; video shows only items with both). The info icon next to the field shows these examples. There are also three quick filters: Active, Had delivery, and Filter selected. The filter applies to the current view: Campaigns, Ad Groups, or Ads.

To find ads by creation or edit date, text, destination URL, or ID, open the Advanced Ad Search, also above the table (available in Google Ads and Meta Ads).