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For best results use one or two words.
Searches for more than one word will be treated as a phrase.
Use the asterisk (*) for wildcard searches: rotor* will find rotor & rotors

• word1 word2 word3 -- searches for documents containing ALL of the listed keywords, not necessarily in that order.
• "word1 word2" -- quotation marks phrases search for documents containing the specified  phrase, with word1 preceding word2, and where both words are adjacent.
• (word1 and not word2) or (word3 and word4) -- searches for documents  for which the specified boolean expresion is true; please note that you can use the and, or, not operators as well as parentheses
• Please note that you can mix the above syntax, e.g.: "word1  word2" or "word1 word3". Another example: "*ord?" and not word1