Outside of suggesting things you've already tried, I don't have anything new to add other than a suggestion that paying someone else to do the search may be the best bet. And by "someone" I mean a professional who's directly answerable to you for results rather than access to a search engine. It seems like the most reliable way to get results, but the cost/benefit equation may not work for you.
Good luck, regardless.
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"They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." - B. Franklin
"There ought to be limits to freedom." - George W. Bush
"We have met the enemy and he is us." - Pogo
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