FamilySearch’s new Full-Text Search experiment allows searching of every name and every word in supported collections, including a large number of U.S. land and probate records. Many users report finding records they never felt like they could find. Go to https://www.familysearch.org/en/search/full-text/collection/list?count=20 to see a list of supported collections or search to see if a specific collection of record is among those supported by full text search.
Go to https://www.familysearch.org/en/rootstech/session/full-text-search to see a video explaining how to use full text search.
Go to https://www.familysearch.org/en/labs and scroll down to “Full Text Search” to use it.