Get search engine results in multiple filetypes -


i want search engines results in multiple content types, example want google result filetypes mp3 , wav , ogg my_keyword , 1 type can type following phrase in google search box

*my_keyword* filetype:mp3

this work correctly don't know how can multiple filetypes

i tried 

   *my_keyword* filetype:mp3,ogg    *my_keyword* filetype:(mp3 | ogg)    *my_keyword* filetype:mp3 | ogg    *my_keyword* filetype:mp3 or oggg

but failed.

in google can use filetype:mp3 or filetype:ogg


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