Para el amor de Rusos y de Alemanes

For the love of Russians and Germans

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Even if they have character sets unreadable (but very familiar) to me, it is enough that I add ".djvu" (the dot before the extension makes the search more meaningful) on my Google search (in addition to the book title and author of course) to search for ebookz which are mostly found on Russian (.ru sites) forums.
And I thank the Germans for hosting the pdf and djvu files.

Ebook Search

Note: Replace "book keywords". Other useful keywords may include .pdf .rar .zip or MB. You simply need to observe what sites have in common aside from the obvious topic. You may also narrow down to Russian sites. Adding inurl:".ru/" may also help, by being more biased to Russian sites.