My primary language is English and all the settings are set accordingly but I am fluent in a number of languages and use to search for things in them too.
When I write a search query in a particular language I want to see occurrences of what I have written, not of its other languages translations. For example when I search for "hybrid" (in English) I want to see the pages containing "hybrid", "hybrids", etc. When I search for "гибрид" (the same word in Russian) I want to see the pages containing "гибрид", "гибриды", "гибрида" etc. but NOT "hybrid", "hybrids", etc. but in reality if I look for "гибрид" (a Russian word) I get results for both "гибрид" and "hybrid" mixed together with the English version dominating. How do I get rid of this?
In both cases it doesn't matter in what of the languages the text ow the results will be? for example if I look for an English word I don't mind a text in Russian containing just this particular word in English.
The things used to work the way I prefer them to in the past but Google tries to be more "smart" today, which I find annoying.
UPDATE: Another good example of how this feature screws up the things is that searching for "ПСС" ("Полное Собрание Сочинений" - "complete set of works" (of a particular author (writer))) gives me results for "GCC" ("Gnu Compilers Collection") instead.