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My read is that you cannot do this. Try viewing an ODT file for starters and you'll see that they are encoded in a non-ASCII visible manner; therefore you cannot run simple grep to accomplish what you're looking for.
I took a quick look at LibreOffice Writer and while one can search, and search well "within" an open document, you cannot do that over multiple documents or have the concept of a Project containing multiple documents where you could search through the scope of all project files. There are macro capabilities for LibreOffice Writer, I don't know if they'd allow you to process multiple documents though.
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