To search for documents from WorkZone Process, you must know part of the title of the document. If you want to search for a document based on the document ID, you should process the search from WorkZone Content Server. In WorkZone Content Server 2016, the search option is already available.
To enable the search feature in WorkZone Content Server 2014, run the script i_ctx_record_title.sql which is located in Program Files (x86) under \KMD\Workzone\Process\Config\scripts in sqlplus:
sql> @i_ctx_record_title.sql
sql> execute create_i_ctx_record_title;
sql>