Perhaps you should try some spelling variations:
"berkeley tanner lectures" » "berkeley annex lectures", "berkeley chapter lectures", "berkeley tanner lecture", "berkeley matter lectures", "berkeley after lectures"
"berkeley carter lectures" » "berkeley chapter lectures", "berkeley castle lectures", "berkeley late lectures", "berkeley carter lecture", "berkeley matter lectures", "berkeley after lectures"
"berkeley unix lectures" » "berkeley usa lectures", "berkeley union lectures", "berkeley six lectures", "berkeley munich lectures"
"berkeley ann lectures" » "berkeley annex lectures", "berkeley kant lectures", "berkeley a 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 carter 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 carter lectures"))) or ("berkeley ann lectures"))) or ("berkeley unix lectures"))*.