Harvest allows the asterisk (*) as a wildcard character when searching for zero or more characters in a string of characters, and the question mark (?), represents any one character.
For example, searching for "Bangkok Church" as the church name may give back the following results:
However if you would look for "Bangkok *Church" it may give back the following results:
So the asterisk (*) means 'anything' in between Bangkok and Church (which can be nothing, but also 'Hope' or 'Christian' in the example above).