text: Online Search Universe Is Expanding (washingtonpost.com) washingtonpost.com - To get an idea of how hot Web search is, go talk to Raul Valdes-Perez, a Carnegie Mellon University professor who is leading a search technology start-up called Vivisimo Inc. He'll tell you that more than 50 venture capitalists have come knocking on his door since January, all seeking a chance to invest in Vivisimo, which recently launched a Web search service under the dopey name of Clusty.