The member search implements a 'starts with' kind of search where Smi in the Last Name would return all members with a last name starting with "Smi" (ie; Smith, Smither, Smickel, etc.). Across the inputs is an implied AND. Therefore, if you were to enter Smi in the Last Name and J in the First Name, the search will return all members with a last name starting with "Smi" and a first name starting with "J".