The search system is one of the most important pillars of information architecture and its design often influences the success of the whole web site. Nowadays to the most important qualitative factor of the websites belongs findability that preceeds usability, credibility and accessibility. If the users cannot find what they need they cannot use it. In practice, there are ten search pattern designs, based on a research of user behaviour, which support users while formulating their search queries. The study analyzes the new trends in designing search user interfaces which are confronted with a search patterns of some Slovak scientific library web sites and the best practices abroad. The detailed analysis of the Slovak library web sites shows that there are no design patterns as personalisation and unified discovery and therefore more attention is paid to these patterns. There are some recommendations for the designers of search that should be taken into account if they want to implement a system that meets user requirements.