Full text searches are great--it takes a little while to find the full text search box for the family history materials in the digital collections at BYU, but I finally did.
http://contentdm.lib.byu.edu/cdm4/search.php
My suggestion is that those unfamiliar with the collection learn about it before searching. This site contains some scanned materials from the Allen County Public Library. One can also perform near searches as well. Pretty interesting.
