You can easily do some "advanced" search techniques in the basic search box on the main Google home page.
"employee participation" [give me only documents that contain this exact phrase]
alternatives-- whatever keywords or key phrases describe your research topic.
salsa -dance [give me results about salsa, that EXCLUDE anything to do with dancing]
alternatives-- whatever keywords you want to exclude from your results.
site:.edu [return ONLY results from education websites]
alternatives-- other domains such as site.:org for non-profits; site:.fr for sites originating in France; etc.
filetype:pdf [return only results that are pdf documents]
alternatives-- other document types such as filetype:ppt for PowerPoint presentations; filetype:doc for Word documents; etc.