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Google Advanced Search & Google Shortcuts
Take advantage of Google's Advanced Search which will focus your search precisely on the subject, sources, date, and format of the information you're seeking.
If it’s the lengthier half of the phrase you can’t remember rather than a single key word, try writing out the first and last words and putting AROUND + (the approximate number of missing words) between them. For example, I wandered AROUND(4) cloud.