You can register .ro domains and every Romanian extension (.com.ro, .info.ro, .org.ro, .store.ro and more), plus international ones such as .com, .net, .org, .e...
Search for the full domain name in search engines and look for previous versions of the website in web archives such as the Wayback Machine. These can reveal clues about its former content, language or association with unwanted activity. Finding no results does not prove that the domain has never been used.
Also check whether the domain appears in reputation services that flag spam or harmful content. Any warning deserves investigation, but no service provides a complete history. A domain being available to register does not mean it has no past.