Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
irrigation scheme » irrigation systems
farm irrigation » scale irrigation, canal irrigation
use integration » une integration, die integration, de integration
supply farm » supply from, support farm
supply use » supply case, supply u.s, supply curve

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( supply farm irrigation scheme. ) OR ( supply use integration theories. ))~".
• Adding a wildcard symbol may retrieve word variants: (( supply farm irrigation scheme. ) OR ( supply use integration theories. ))*.