Perhaps you should try some spelling variations:
"clarendon pressure series" » "clarendon press series", "clarenoon press series", "clarendon pressure surges", "clarendon pressure theories", "clarendon pressure studies"
"clarendon pressure sores" » "clarendon press sores", "clarenoon press sores", "clarendon pressure sensors", "clarendon pressure studies"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"clarendon pressure series\") OR (\"clarendon pressure sores\"))".
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