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

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