Perhaps you should try some spelling variations:
"descriptions clauses" » "description clauses", "descriptions causes"
"descriptions phase" » "description phase"
"descriptions based" » "description based"
"descriptor based" » "descriptors based", "description based"

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