[Evolution] several keywords in filters

[No more cries <nomorecries gmail com>]

Hello !
I use filters for the incoming messages, based on the subject. I wanted to know if I could give several keywords at once just by filling one field. I want the filter to place the message in a folder if just one keyword fits. How could I fill the field <subject> <contains> and separate my different keywords, saying that it's not an "and" but an "or".. i tried like that :
<subject> <contains> : x | y | w | z 
<subject> <contains> : x ; y ; w ; z
<subject> <contains> : x , y , w , z

but none of these worked... is there a way or should i create several and same conditions for each different word ?
hope I'm clear ...
thanks !