If properly structured, it should be easy to find assets just by navigating the folder tree. Of course in large data-sets it is often faster and easier to use the search.
search is built in the scoopa core and available in many places.
For more complex queries you can use the advanced search which is also located under "Search":
You can construct simple or very complex search conditions using the "and/or" operator as well as using multiple rules and rule-groups. Rule-Groups can contain multiple rules itself and can be combined. See following examples: