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.
marketing AND social media
Use quotation marks ( " " ) around phrases (two or more words); this tells the database to look for the words in that specific order.
"social media" AND marketing
Use an asterisk (*) to find multiple endings of one word. Using promot* as a search term will include results that refer to promote, promotes, promoted, promoting, promotional, and promotion.
promot*