Perhaps you should try some spelling variations:
"berkeley tanner lectures" » "berkeley carter lectures", "berkeley chapter lectures", "berkeley tanner lecture", "berkeley matter lectures", "berkeley after lectures"
"berkeley annex lectures" » "berkeley andrew lectures", "berkeley june lectures", "berkeley one lectures", "berkeley index lectures", "berkeley annual lectures", "berkeley index lecturers", "berkeley kantex lectures", "berkeley aex lectures", "berkeley oneex lectures"
"berkeley unix lectures" » "berkeley usa lectures", "berkeley union lectures", "berkeley six lectures", "berkeley munich lectures"
"berkeley ann lectures" » "berkeley kant lectures", "berkeley a lectures", "berkeley one lectures", "berkeley main lectures", "berkeley infn lectures", "berkeley bonn lectures"

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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((("berkeley tanner lectures") OR ("berkeley annex lectures"))) OR ("berkeley ann lectures"))) OR ("berkeley unix lectures")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"berkeley tanner lectures\") OR (\"berkeley annex lectures\"))) or (\"berkeley ann lectures\"))) or (\"berkeley unix lectures\"))".
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• Adding a wildcard symbol may retrieve word variants: (((((("berkeley tanner lectures") OR ("berkeley annex lectures"))) or ("berkeley ann lectures"))) or ("berkeley unix lectures"))*.