Perhaps you should try some spelling variations:
"specific protocols ports" » "specific protocol ports", "scientific protocols ports", "specific proteins ports", "specific protocols part", "specific protocols short"
"specific proposals short" » "specific purposes short", "specific process short", "specific promoters short", "specific proposals how", "specific proposals sent", "specific proposals set"

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: (("specific protocols ports") OR ("specific proposals short")).
• Removing quotes may allow a broader search: (( specific protocols ports ) or ( specific proposals short )).
• Adding a wildcard symbol may retrieve word variants: (("specific protocols ports") or ("specific proposals short"))*.