If you know exactly what you're looking for, Atlan suggests using exact match search. Wrap the search terms within double quotation marks " " when typing it in the search bar. For example, "instacart_total_users".
For contextual search, the Assets page provides a number of filters to help you narrow down your search results. Filter data assets by various properties, asset types, and so on.
The search results in Atlan also provide a quick count of all the resulting data assets, organized by asset type. These counts will alter in real time as you apply filters.