나는 시도했다
(search term site:stackoverflow.com) OR (search term site:superuser.com) OR (search term site:stackexchange.com)
search term site:stackoverflow.com,superuser.com,stackexchange.com
search term site:stackoverflow.com site:superuser.com site:stackexchange.com
그들 중 누구도 작동하지 않습니다. 올바른 검색 방법은 무엇입니까?