Hi, @lifelin
the default Magento search functionality applies only to the current Store View.
It makes a lot of sense, since if you, for example, have stores for English and French markets, it's pointless to deliver the results in French to the English-speaking audience.
If you'd like to extend the functionality of the default Magento search, and make it more user-centered and flexible, you may want to check this extension: http://www.mageworx.com/search-suite-magento-extension.html
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