Perhaps you should try some spelling variations:
integration theory » integration through, information theory, innovation theory
irrigation schemes » irrigation scheme, irrigation systems
cost integration » post integration, test integration, about integration
crop irrigation » drip irrigation, scale irrigation, canal irrigation
supply crop » supply crowd, supply from, supply europe
supply cost » supply costs

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

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