If I understand what you are trying to accomplish, you are checking to see if $nick is either NickServ MemoServ or Chanserv.. To do that:
$istok(ChanServ MemoServ NickServ,$nick,32)
It takes this format: $istok(Text,Search,Seperator)
If "search" is a matching token in "text", it'll report $true.
Hope that helps some.