Select the most important 2-3 terms related to your topic. Put the word AND between each new term; this tells the database to look for resources with ALL your terms.
endangered species AND conservation
Use quotation marks ( " " ) around phrases (two or more words); this tells the database to look for the words in that specific order.
"endangered species" AND laws
Use OR in between similar concepts.
(endangered OR protected) AND wildlife
Use an asterisk ( * ) to find multiple endings of one word. Using pollut* as a search term will include results that refer to pollute, pollutes, polluted, polluting, and pollution.