I’m frustrated

Can't search in ebook...

Hi I recently bought and downloaded a copy of "Stats" and Im finding that I can't search for obvious stats words and phrases like "standard deviation" which is weird and makes the book less than useful. One of the reasons I wanted an ebook was I could do fast free word searching. Can I get another version that works or is this an insurmountable problem? I would prefer to get ebooks but won't if this problem cant be resolved. Thanks
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