[naivepiano]

You have to know either the jurisdiction (offshore country) of the company or the name of the person. What would be quite valuable would be a search based on the linked countries. E.g. companies/ppl linked to Italy.

[pepyn]

You can do this by leaving the search field blank and just selecting a country, which returns all entities/officers/intermediaries/addresses for a certain country

[mgalka]

There is a torrent that lets you download the whole database. Though the structure of it and what the fields represent is not so easy to figure out.