Perhaps you should try some spelling variations:
integration theories » integration theory, integration through, integration efforts
integrated services » internet services
deeper integration » deep integration, deepening integration, sector integration
grid integrated » gain integrated, grid integration, ii integrated
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 integrated services. ) or ( supply deeper integration theories. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( support grid integrated services. ) OR ( supply deeper integration theories. )).
• Adding a wildcard symbol may retrieve word variants: (( support grid integrated services. ) or ( supply deeper integration theories. ))*.