Where Google searches the web for anything related to your search, Google Scholar filters out everything except the scholarly resources that you need. You can access Google Scholar here. The LTU Library also hosts a tutorial on Google Scholar.
HathiTrust is a partnership of academic & research institutions, offering a collection of millions of titles digitized from libraries around the world. HathiTrust resources are searchable through TechCat as well as the HathiTrust website.