Ancestry uses a fuzzy matching algorithm for many search fields. Unless you click on "Exact" and even then, it would typically search for both Russia and Poland. You can also include both Russia and Poland in your searches. Worst case, you can move the sliders next to the various fields to widen or narrow your search region.

Another example is Hungary where it would find Slovakia, Czechoslovakia and even Ukraine.
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Jeff Goldner
Researching Goldner, Singer, Neuman, Braun, Schwartz, Gluck, Reichfeld (Hungary/Slovakia); Adler, Roth, Ader (Galicia); Soltz/Shultz/Zuckerman/Zicherman (Vitebsk, maybe Lithuania), Wald and Grunfeld (Secovce, Slovakia fka Galszecs)