Perhaps you should try some spelling variations:
"descriptions system" » "descriptor systems"
"descriptions plate" » "descriptions places", "descriptions state", "descriptions phase"
"descriptive phase" » "descriptive case", "descriptive plates", "descriptions phase"

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