Use "AND" or "OR" for Boolean searches.

Use quotes to force recognition of words strung together as phrases.

Words strung together without quotes are treated as phrases unless the words "and" or "or" are part of the phrase.

Examples:
[Common Good] will return lessons with the phrase "Common Good" in their lesson summary.

["Philanthropy or History"] will return lessons with the phrase "Philanthropy or History", while [Philanthropy or History] will return lessons that have the either the word "Philanthropy" or the word "History" in their lesson summary.

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