Perhaps you should try some spelling variations:
"specified protocols routing" » "specific protocol routing"
"specific protocols routing" » "specific protocol routing", "specific proposals routing", "scientific protocols routing"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"specified protocols routing\") OR (\"specific protocols routing\"))".
• Removing quotes may allow a broader search: (( specified protocols routing ) OR ( specific protocols routing )).
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