Perhaps you should try some spelling variations:
annual lectures » annual lecture, annual returns, general lectures
index lectures » index lecturers, indexes lecturers, index apertures
berkeley unix » berkeley usa
unix lectures » union lectures, six lectures, munich lectures

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 (((annual lectures) OR (annual legumes)))) ) OR ( berkeley unix lectures )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( berkeley ((index lectures) or (((annual lectures) OR (annual legumes)))) ) or ( berkeley unix lectures ))".
• Adding a wildcard symbol may retrieve word variants: (( berkeley ((index lectures) or (((annual lectures) OR (annual legumes)))) ) or ( berkeley unix lectures ))*.