Perhaps you should try some spelling variations:
"endoloop-assisted endoscopic selection" » "endoloop-assessed endoscopic selection" (Expand Search), "endoloop-assisted endoscopic detection" (Expand Search)
"endoloop-assisted endoscopic reduction" » "endoloop-assessed endoscopic reduction" (Expand Search), "endoloop-assisted endoscopic education" (Expand Search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"endoloop-assisted endoscopic selection\") OR (\"endoloop-assisted endoscopic reduction\"))~".
• Removing quotes may allow a broader search: (( endoloop-assisted endoscopic selection ) OR ( endoloop-assisted endoscopic reduction ))~.
• Adding a wildcard symbol may retrieve word variants: (("endoloop-assisted endoscopic selection") OR ("endoloop-assisted endoscopic reduction"))*.