Perhaps you should try some spelling variations:
"descriptive clause" » "descriptive case", "descriptive claims", "descriptions clauses"
"descriptions paper" » "descriptions papers", "description paper", "descriptions papetri"
"descriptions based" » "description based", "descriptors based", "descriptor based"

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("descriptive clause") OR ((("descriptions paper") OR ("descriptions based")))).
• Removing quotes may allow a broader search: (( descriptive clause ) or ((( descriptions paper ) or ( descriptions based )))).
• Adding a wildcard symbol may retrieve word variants: (("descriptive clause") or ((("descriptions paper") or ("descriptions based"))))*.