Perhaps you should try some spelling variations:
index apertures » coded apertures, index lectures, new apertures
berkeley index » berkeley annex, berkeley andrew, berkeley unix
berkeley risc » berkeley rick, berkeley usa, berkeley r
risc lectures » his lectures, crisis lectures, paris 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 apertures ) OR ( berkeley risc lectures )).
• Adding a wildcard symbol may retrieve word variants: (( berkeley index apertures ) or ( berkeley risc lectures ))*.