Perhaps you should try some spelling variations:
international efforts » international airports, international energy, international airport
grid international » 3rd international, third international, build international
integration theory » integration through, information theory, innovation theory
support grid » support agri, support grant, support group

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

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