Google Scholar [scholar.google.com] is different from Google. Google searches public web content - if your instructor says not to use Google, they probably mean they don't want you to use content from the public web. Google Scholar, however, searches journal and conference papers, theses and dissertations, academic books, pre-prints, abstracts, technical reports and other scholarly literature.
Is Google Scholar right for my research?
Google Scholar is useful for:
Google Scholar cannot:
Searching in Google Scholar is imprecise when compared with discipline-specific databases. If your research requires very comprehensive searching, or if you are not satisfied with Google Scholar's results, use individual research databases.