Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
interaction series » interactions series, interaction studies, interaction terms
some international » time international, care international, people international
water interaction » matter interaction, layer interaction, matter interactions
supply some » supply side, supply cote, supply scheme

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

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