Perhaps you should try some spelling variations:
integration theory » integration through, information theory, innovation theory
side integration » die integration, de integration, life integration
canal irrigation » scale irrigation
supply canal » supply canada, supply annual, supply china
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 side integration theory. ) or ( supply canal irrigation systems. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply side integration theory. ) OR ( supply canal irrigation systems. )).
• Adding a wildcard symbol may retrieve word variants: (( supply side integration theory. ) or ( supply canal irrigation systems. ))*.