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

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 data"))) OR ("descriptive case"))) OR ((("descriptions phase") OR ("descriptions based")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((((\"descriptive image\") OR (\"descriptive data\"))) or (\"descriptive case\"))) or (((\"descriptions phase\") or (\"descriptions based\"))))".
• Removing quotes may allow a broader search: (((((( descriptive image ) OR ( descriptive data ))) or ( descriptive case ))) or ((( descriptions phase ) or ( descriptions based )))).
• Adding a wildcard symbol may retrieve word variants: (((((("descriptive image") OR ("descriptive data"))) or ("descriptive case"))) or ((("descriptions phase") or ("descriptions based"))))*.