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I don't know of a way to do this inside of Paratext. However, you can search for multiple renderings in the file called TermRenderings.xml (found in the project directory). Be very careful when you work in the files outside of Paratext.
If you use a tool like Notepad or Notepad++ you can search for || (this is the pipe character found above the \ on an English keyboard).
Here is a quick video.