Perhaps you should try some spelling variations:
"world environment working papers" » "work environment working papers", "grid environment working papers", "arid environment working papers", "world environment working paper"
"cold environment working papers" » "cold environments working papers", "cloud environment working papers", "food environment working papers", "cold environment working paper"

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"cold environment working papers\") OR (\"world environment working papers\"))".
• Removing quotes may allow a broader search: (( cold environment working papers ) OR ( world environment working papers )).
• Adding a wildcard symbol may retrieve word variants: (("cold environment working papers") OR ("world environment working papers"))*.