Perhaps you should try some spelling variations:
"vertical interconnections" » "vertical interconnection", "optical interconnections", "partial 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: (("vertical interconnections") OR ("partial interconnection")).
• Removing quotes may allow a broader search: (( vertical interconnections ) or ( partial interconnection )).
• Adding a wildcard symbol may retrieve word variants: (("vertical interconnections") or ("partial interconnection"))*.