Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
curve international » survey international, care international, turkey international
integration some » integration volume, integration power, integration south
tax integration » can integration, tax interaction, trade integration
support tax » support a, support staff, support state

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply curve international efforts. ) or ( support tax integration some. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply curve international efforts. ) OR ( support tax integration some. )).
• Adding a wildcard symbol may retrieve word variants: (( supply curve international efforts. ) or ( support tax integration some. ))*.