Perhaps you should try some spelling variations:
integration theory » integration through, information theory, integration report
data integration » trade integration, _ integration, data integrity
crop irrigation » drip irrigation, scale irrigation, canal irrigation
how irrigation » from irrigation, high irrigation, _ irrigation
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 ((how irrigation) OR (crop irrigation)) scheme. ) or ( supply data integration theory. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply ((how irrigation) OR (crop irrigation)) scheme. ) OR ( supply data integration theory. )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( supply ((how irrigation) OR (crop irrigation)) scheme. ) or ( supply data integration theory. ))".
• Adding a wildcard symbol may retrieve word variants: (( supply ((how irrigation) OR (crop irrigation)) scheme. ) or ( supply data integration theory. ))*.