Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
irrigation schemes » irrigation scheme, irrigation systems
supply case » supply chain, supply curve, supply costs
supply cost » supply costs
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 case) OR (supply cost)) irrigation schemes. ) or ( supply grid integration theories. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((supply case) OR (supply cost)) irrigation schemes. ) OR ( supply grid integration theories. )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((supply case) OR (supply cost)) irrigation schemes. ) or ( supply grid integration theories. ))".
• Adding a wildcard symbol may retrieve word variants: (( ((supply case) OR (supply cost)) irrigation schemes. ) or ( supply grid integration theories. ))*.