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I don't know if i am allowed to talk about other software here, but you might use the (commercially available) dtSearch Desktop: h*tp://www.dtsearch.com/plf_desktop_2.html
It allows you to index text in your entire library (every single book, even terabytes of data) and search for specific words or sentences in a matter of seconds. It does not support the ePub format natively, but ePubs are nothing more than archives containing .xhtml files among the others, which cointain text that dtSearch can extract and index.
You might feel like using very strict filters to get exactly what you want, and results are displayed by relevance/occurrence in a separate window. Not just the word/sentence you were looking for, but an extract of the entire page will be shown in that window.
I use it regularly for research purposes.
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