Perhaps you should try some spelling variations:
"descriptions state" » "descriptions system", "descriptions some", "descriptions soil"
"descriptive phase" » "descriptive case", "descriptive plates", "descriptions phase"
"descriptive based" » "description based", "descriptive basis", "descriptive case"

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