To be able to do complete searches you need to start the job that will populate the search data.
Navigate to System tools → ConfigManager → DigiZuite™ DAM Center and select the latest version available. Navigate to Searches tab and select DigiZuite_System_Framework_Search. To start the job, press the gear icon. Once it is completed, you are able to perform searches based on title, description, keywords, etc. (Sometimes this is not neede since the installation has populated the search automatically - hence no cog wheel available).