It's often hard to find info on TLDs via Google--it treats ".com" as "com," which will provide completely unrelated info.
The best way to search is by using the TLD, the country the TLD represents (if any), and any additional keywords.
Using the term [ bz ] will return results related to Belize, since it's a common acronym for the country.
Using the terms [ bz belize ] will return info on the TLD.
Using the terms [ bz belize domains ] will return info on different registrars for .bz domains.
Hope that helps