Heting Chu2014-10-272014-10-271999-10-??http://rportal.lib.ntnu.edu.tw/handle/20.500.12235/15442Recent developments of Web search tools are illustrated and discussed with particular emphases on precise search, natural language search, multilingual search and translation, new ranking and selection techniques, multimedia searching, filtered or customized search, intelligent agents as well as browsing and searching integration. In addition, the author explores the future direction of Web search tool developments, which includes efforts in increasing search precision, and enhancing concept search capability of those services.搜尋引擎Web search toolsSearch engineInformation technology