Phonetically Like (the default): Groups names that sound alike across languages. Best for almost every search.
Schwartz also finds Shvarts, Cvartz.
Is Exactly: Your exact spelling, plus JewishGen's built-in name synonyms. The only mode that reads wildcards.
Chana also finds Hannah, Anna.
Wildcards (*): Fill in unknown letters anywhere in a name. Works only with Is Exactly.
Sch*artz finds Schwartz, Schvartz.
Comma = OR, Space = AND: A comma finds either name; a space requires both.
Schwartz, Weiss vs. Schwartz Weiss.
Fuzzy matches: Allow one, two, or more letters of difference (Fuzzy, Fuzzier, Fuzziest).
Cohen finds Cohan, Kohen.
Narrow by place last: Search by name first; add a region only if you get too many hits.