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

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

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