Using Boolean Logic (AND, OR, or NOT) can help you expand and limit your search results.
This will only produce results that contain both of these words. A simple search for tourism sustainability would produce results that contain either tourism or sustainability opposed to only results that contain both words.
This will produce results for all of these terms which may be useful when you trying to find articles on the lodging industry.
This will produce results for business articles or reports that discuss arenas and do not contain any mention of hockey. This could help you weed out unwanted results if you were looking for articles on arenas that don't have hockey teams.
Other search limiters (an asterisk, quotations, and parentheses), and how they can help you refine or expand your searches:
This will produce results for advertising, advertisements, advertisement, and advertisers.
Example: “college athletics”
Example: Marriott AND (“brand share” OR “market share”)
This will produce results that contain the word Marriott and the exact phrase “market share” or results that contain the word Marriott and the exact phrase “brand share”