Perhaps you should try some spelling variations:
integration theory » integration through, information theory, innovation theory
furrow irrigation » farm irrigation, crop irrigation, flood irrigation
irrigation scheme » irrigation systems
support furrow » support from, support follow
supply grid » supply crowd, supply great, support grid

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply grid integration theory. ) or ( support furrow irrigation scheme. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply grid integration theory. ) OR ( support furrow irrigation scheme. )).
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