Web search engine almost never searches (only) for the words that users type in. Instead, during query processing phase, the engine tries to predict additional terms to search for. This is especially important for misspelled queries. The talk will provide details about how machine learning can be used to "read" user's mind for a correct version of the query. It is not a neuroimaging presentation but rather a brief history and current research of the spelling error correction system in the Seznam.cz's search engine".