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Where can I find a searchable copy of the Maharal's Netivot Olam (Netiv haTorah specifically) online?
Well wikisource has bits and pieces as far as I can tell, over here. And you can see all 4 seforim over here).
You can also find it on HebrewBooks.org (pdf's are searchable, but not so good because of OCR) here and here.