Information retrieval through the Web is a multifaceted process and many side elements may affect on this procedure, for example searching the keyword h2s measurement. Nevertheless, our current knowledge about the complexity of this course of actions is limited. In spite of all remarkable progress in developing more sophisticated information retrieval tools on the Web, people may still encounter many difficulties for locating information they need for meeting their information needs. Although developing web-based search tools has been inspired by pre-web online information retrieval systems, a couple of unique features of the Web environment and the wide range of Web users’ characteristics impose new condition for searching and retrieval situation
