Phrase Searching
If you have a phrase that should be kept together (like social psychology), put it in quotation marks. This will prevent you from receiving results that say social in one part of the Web page and psychology in another.
Limit to Gov or Edu Sites
In Google, you may limit your search results to government (.gov) or educational (.edu) sites by typing site:edu or site:gov in the search box after your terms. These sites are generally considered to be more reputable than other types of sites, and may be better for college-level research.