Perhaps you should try some spelling variations:
integration theory » integration through, information theory, integration report
chain integration » trade integration, data integration, grid integration
canal irrigation » scale irrigation
supply canal » supply annual, supply rural, supply case
systems. » system.

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

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