Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
integration volume » integration von
cost integration » post integration, test integration, about integration
canal irrigation » scale irrigation
supply canal » supply canada, supply annual, supply china
supply cost » supply costs

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

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