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Open a Finder window. Type a single letter into the Spotlight search box. Wait a sec.... Delete the letter. Click on the little plus icon (top right). A new search parameter should appear. In the first drop down menu select "Size". You should be able to figure the rest out.
 
Open a Finder window. Type a single letter into the Spotlight search box. Wait a sec.... Delete the letter. Click on the little plus icon (top right). A new search parameter should appear. In the first drop down menu select "Size". You should be able to figure the rest out.
thanks. It looks like you have to type 1 letter to get the search starting and then the additional sort fields will be able to be added.

Thanks again.
 
Easier: You can also just hit cmd+F in any Finder window.

(I know, the thread's old)
 
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