Perhaps you should try some spelling variations:
index lecturers » indexes lecturers, invited lecturers
index lectures » indexes lecturers, index apertures, mendel lectures
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 (index lecturers)) ) OR ( berkeley unix lectures )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( berkeley ((index lectures) OR (index lecturers)) ) or ( berkeley unix lectures ))".
• Adding a wildcard symbol may retrieve word variants: (( berkeley ((index lectures) OR (index lecturers)) ) or ( berkeley unix lectures ))*.