Perhaps you should try some spelling variations:
"intraoperative revision administration" » "intraoperative aviation administration", "intraoperative vista administration", "intraoperative servieces administration"
"intraoperative opioid administration" » "intraoperative fluid administration", "intraoperative 3d administration", "intraoperative oxygen administration", "intraoperative public administration", "intraoperative vista administration"

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("intraoperative opioid administration") or ("intraoperative revision administration"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("intraoperative opioid administration") OR ("intraoperative revision administration"))*.
• Removing quotes may allow a broader search: (( intraoperative opioid administration ) or ( intraoperative revision administration ))*.