Perhaps you should try some spelling variations:
"vascular surgery procedures" » "vascular surgical procedures"
"vascular safety procedures" » "vascular safety proceedings", "vascular safety properties", "vascular variety procedures", "vehicular safety procedures", "vascular soft procedures"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"vascular surgery procedures\") OR (\"vascular safety procedures\"))".
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