Leaving the “exact” box at FamilySearch brings about more search results. But it is not perfect.
A search on the 1885 Nebraska State Census database for Frank Goldenstein (unchecked) brings about no results. Yet a search of the same database for Frank Guldensten locates the reference to Frank Goldensten as shown below.
While Goldenstein, Goldensten, and Guldensten may seem similar–apparently the FamilySearch system does not think they are all close enough to be “equivalent” when the exact button is checked. It pays to experiment and make notes of such idiosyncrasies.