How to use Search Tokens in Lion Mail?

To find a message, go to the search bar in the top right hand corner of Mail. Type in the search key about the message -- can be person or subject. While you are typing the search key, there is a list of options appear as the pull down manual like Spotlight. Then click on any of those search suggestions to add a token in the search field.
There are many other available tokens when you click on the small downward arrow besides your term.

To specify a date, just simply type in a month followed by 4-digit year then you can have "date" token.

Then you can enter as many different search terms after each token.

Furthermore, you can even save your search as a Smart Mailbox by clicking the save button which just below the search bar.