Memory blank: how to search for file contains certain words in the body of a file (RTF, HTML, PDF, etc)?

I am having a memory blank and can’t remember how to search for one or multiple words in the body of an item (RTF, HMTL, or PDF or other file)
For the title, it would be name contains, but what corresponds to the body of the file ?
My question refers to either imported files or files created from within DevonThink
Sorry for a dumb question and thank you in advance

Content

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thank you very much @pete31
my confusion stems from the fact that I expected content contains or at least have the contains option. It seems that boolean operators are the only option.
What would be the boolean equivalent of “contains the word test123” ?
thanks again