Perhaps you should try some spelling variations:
"international ports economies prone" » "international airports economies prone", "international poverty economies prone", "international efforts economies prone", "international port economics prone", "international poor economies prone", "international ports economies from", "international ports economies jane", "international ports economies more"
"international energy economic work" » "international energy economics work", "international energy economy work", "international ecology economic work", "international energy economic boom", "international energy economic well"

Try widening your search to All Fields.

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("international ports economies prone") or ("international energy economic work"))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("international ports economies prone") OR ("international energy economic work")).
• Removing quotes may allow a broader search: (( international ports economies prone ) or ( international energy economic work )).
• Adding a wildcard symbol may retrieve word variants: (("international ports economies prone") or ("international energy economic work"))*.