Google has overhauled its search algorithm, the foundation of the Internet’s dominant search engine, to better cope with the longer, more complex queries it has been getting from Web users. Amit Singhal, senior vice president of search, told reporters on Thursday that the company launched its latest “Hummingbird” algorithm about a month ago and that it currently affects 90 percent of worldwide searches via Google. Google is trying to keep pace with the evolution of Internet usage. As search queries get more complicated, traditional “Boolean” or keyword-based systems begin deteriorating because of the need to match concepts and meanings in addition to words. “Hummingbird” is the company’s effort to match the meaning of queries with that of documents on the Internet, said Singhal from the Menlo Park garage where Google founders Larry Page and Sergey Brin conceived their now-ubiquitous search engine.