Perhaps you should try some spelling variations:
berkeley index » berkeley annex, berkeley andrew, berkeley unix
index lectures » index lecturers, indexes lecturers, index apertures
berkeley six » berkeley unix, berkeley son, berkeley xi
six lectures » six letters

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( berkeley index lectures ) OR ( berkeley six lectures )).
• Adding a wildcard symbol may retrieve word variants: (( berkeley index lectures ) or ( berkeley six lectures ))*.