Perhaps you should try some spelling variations:
irrigation system » irrigation systems, irrigation water, irrigation scheme
innovation theory » innovation through, motivation theory
china irrigation » change irrigation, canal irrigation, high irrigation
data innovation » der innovation, digital innovation, data integration
supply china » supply chains, 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 china irrigation system. ) or ( supply data innovation theory. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply china irrigation system. ) OR ( supply data innovation theory. )).
• Adding a wildcard symbol may retrieve word variants: (( supply china irrigation system. ) or ( supply data innovation theory. ))*.