Perhaps you should try some spelling variations:
integration theories » integration theory, integration through, integration efforts
data integration » trade integration, _ integration, data integrity
grid irrigation » drip irrigation, syria irrigation, crop irrigation
support grid » support agri, support grant, support group
supply data » supply water

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply data integration theories. ) or ( support grid irrigation (systems. OR system.) ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply data integration theories. ) OR ( support grid irrigation (systems. OR system.) )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( supply data integration theories. ) or ( support grid irrigation (systems. OR system.) ))".
• Adding a wildcard symbol may retrieve word variants: (( supply data integration theories. ) or ( support grid irrigation (systems. OR system.) ))*.