Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
chain international » chains international, main international, can international
interaction series » interactions series, interaction studies, interaction terms
grant interaction » graph interaction, gradient interaction, plant interactions

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: (( supply chain international efforts. ) OR ( support grant interaction series. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply chain international efforts. ) or ( support grant interaction series. ))*.