Entermedia Asset Search Box accepts default AND, OR search operators, You can use them to refine your searches.
This tool searches for Assets querying the Internal Description field, this field is created and managed by EnterMedia to include as Search Keywords all the fields that we define in the Asset Table as "Used in Keywords" in the Advanced Options section in the Customize Fields Tab.
Go to Settings, Database, select asset table and the field you want to include.
If you are enabling new fields as Search Keywords to existing data you are required to reindex the asset table in order to populate the Internal Description field.
Go to Settings, Database, select asset table and click on Reindex.