Using Help : Search Guidelines

Search Guidelines
Use the following rules for formulating search queries:
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Searches are not case-sensitive, so you can type your search in uppercase or lowercase characters.
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Punctuation marks (such as the period, colon, semicolon, comma, and hyphen) are ignored during a search, unless they are part of the topic (such as .WAV).
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You can search for a literal phrase by using quotation marks. You cannot search for quotation marks.