You can easily do some "advanced" search techniques in the basic search box on the main Google home page.

More sample searches:

"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.

Find Google Advanced Search at https://www.google.com/advanced_search.