Remember when using the search boxes at FamilySearch that the "unexact search" (with the box unchecked) is not quite the same as a "soundex" search.
A search for Edward Lawson (exact box unchecked) (wife Mary) born 1800-1815 does not give the same research results as a search for Edward Layson (exact box unchecked) (wife Mary) born 1800-1815.
Lawson and Layson are Soundex equivalents.
There are numerous other examples, but do not assume that since you left the "exact box" unchecked, you'll get all the Soundex equivalents at FamilySearch. You won't.
You'll still get many variants...but just keep this in mind.