Perhaps you should try some spelling variations:
"descriptive clause" » "descriptive case", "descriptive claims", "descriptions clauses"
"descriptions phase" » "descriptions plate", "descriptions places", "descriptions based"
"descriptors based" » "descriptor based", "description based", "descriptors a"

Try widening your search to All Fields.

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 phase") OR ("descriptors based")))).
• Removing quotes may allow a broader search: (( descriptive clause ) or ((( descriptions phase ) or ( descriptors based )))).
• Adding a wildcard symbol may retrieve word variants: (("descriptive clause") or ((("descriptions phase") or ("descriptors based"))))*.