Perhaps you should try some spelling variations:
"world economic and financial service." » "world economic and financial services.", "world economy and financial service."
"world economic and financial stress." » "world economic and financial distress.", "world economic and financial access.", "world economic and financial strength.", "world economy and financial stress."
"world economic and financial barriers." » "world economy and financial barriers."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (((("world economic and financial service.") or ("world economic and financial stress."))) or ("world economic and financial barriers."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((("world economic and financial service.") OR ("world economic and financial stress."))) OR ("world economic and financial barriers.")).
• Removing quotes may allow a broader search: (((( world economic and financial service. ) or ( world economic and financial stress. ))) or ( world economic and financial barriers. )).
• Adding a wildcard symbol may retrieve word variants: (((("world economic and financial service.") or ("world economic and financial stress."))) or ("world economic and financial barriers."))*.