Perhaps you should try some spelling variations:
integration theories » integration theory, integration through, integration efforts
grid integration » trade integration, _ integration, data integration
aid conservation » land conservation, bird conservation, basic conservation
supply grid » supply crowd, support grid
supply aid » supply side, supply a, supply chain

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

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