Perhaps you should try some spelling variations:
"optical interconnections" » "optical interconnects", "optical interactions"
"digital interconnections" » "digital interconversion", "digital intersections", "optimal interconnections"
"partial interconnection" » "partial interconnections", "particles interconnection", "vertical interconnection"

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: (("optical interconnections") OR ((("partial interconnection") OR ("digital interconnections")))).
• Removing quotes may allow a broader search: (( optical interconnections ) or ((( partial interconnection ) or ( digital interconnections )))).
• Adding a wildcard symbol may retrieve word variants: (("optical interconnections") or ((("partial interconnection") or ("digital interconnections"))))*.