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Use word1 word2 to find all posts which contain either word1 or word2.
Use +word1 +word2 to find all posts which include both word1 and word2.
Use +word1 +word2 -word3 to find all posts which include both word1 and word2, but not word3.
Use "word1 word2" (with the double-quotes) to search for an exact phrase.