For natural phrases, such as varicella zoster virus, use quotation marks.
Example: "varicella zoster virus "
To limit to authoritative websites, choose a preferred domain (.edu, .gov or .org) by adding site:.domain
Example: Add site:.org to your search.
NOTE: Be sure not to include spaces between site: and the domain.
To remove items, use the minus sign.
Example: Add -wiki at the end of your search phrase
Five Criteria for Evaluating Websites
Accuracy
Authority
Objectivity
Currency
Coverage