When searching the Paratext Registry there are filters that you can use:
country:[two letter country code found here]
Example: country:gb (Great Britain)
org:[organization name as shown in the URL for that organization’s page]
Example: org:sil-international-in-africa
language:[using two or three-letter codes]
Example language:fr (French)
script:[script name]
Example script:Latn
type:[type of project] (First, New, Revision, “Study / Help Material”)
Example type:First type:“Study / Help Material” (quotes needed for this one)
is:[specific attributes] (confidential, revoked)
Example is:confidential
visibility:[standard, confidential, or training] (Standard, Confidential, “Test or Training”)
Example visibility:"Test or Training"
NOTE! You can combine searches by using two filters separated by a space:
org:sil-international-in-africa country:tg