Note the use of "OR" to retrieve all articles containing either term (the union of A+ B). Use "OR" when either word can represent your idea. The Boolean "OR" broadens your search, increasing the number of hits.
Connecting separate concepts with "AND" narrows the search by ensuring that both ideas are mentioned in each article you retrieve (the intersection of A and B).
Enclosing words in quotations retrieves the exact phrase: "chief executive officer." |