Mail.app : smart Mailbox misbehaves with condition "any"

Weird problem I found out today.

I created a Smart Mailbox to help me filtering messages to a certain company (for example : Apple)

• the condition in the Smart Mailbox is "entire message contains Apple"
• It works fine.

I want to add a second criteria to group messages about a second company (for example : Mac)

• the conditions now look like : "contains messages that match ANY of the following conditions"
  • entire message contains "Apple"
  • entire message contains "Mac"
• It doesn't show any result at all !!!!

Trying to do the filtering by changing "ANY" to "ALL" works correctly.

What's wrong here ? Do I have a wrong perception of what "ANY" means ?