Perhaps you should try some spelling variations:
integration efforts » international efforts, conservation efforts
irrigation system » irrigation systems, irrigation water, irrigation scheme
et irrigation » led irrigation, _ irrigation, water irrigation
supply ann » supply a, supply annual
supply et » supply _, supply a, supply 3

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

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