Perhaps you should try some spelling variations:
integration volume » integration von
irrigation scheme » irrigation systems
canal irrigation » scale irrigation
supply regional » support regional, supply seasonal
supply canal » supply canada, supply annual, supply china

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

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