The asterisk symbol * can be used in two ways as a searching shortcut.
This allows you to search for variations of one word without having to write each word out independently. Simply write out the root word and add the truncation symbol at the end.
Searches: addict, addiction, addictive, addicted and addicting
This allows you to search words that have a different character in the middle of a word rather than a shared root.
Searches: woman and women
Putting quotation marks around a phrase in your search string will make sure that your results come back relevant. Quotation marks will search your phrase as a concept as opposed to individual words.
Searches: North America
Searches: North America, South America, America, north and so forth