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There are a number of resources available on people groups. However, not every obscure people will have much written about it. Here are a few suggestions:
EBSCO QuickSearch: a multidisciplinary database search in our library
The Joshua Project at https://www.joshuaproject.net/: an online database of unreached people groups
Operation World: an online website with people group information arranged by country
The Ethnologue: an online site tracing the development of culture and language
You may also find that you need more information on the countries in which these unreached people groups are located. Check out this FAQ on locating information about a country's culture.
If you have any additional questions, feel free to reach out to us at (434) 582-2220 or at research@liberty.edu.