I would like to ask you about search of the use of the words in Google or other search engines. For example if I want to search how "explain" and" idea" are getting together, how can I search this? if I write just explain idea in Google there is one in some results but not another. For example one result is "From the fact that a given idea." here as you see there is not explain or explained. What about trying (explain | explained) idea ? Thank you.