Perhaps you should try some spelling variations:
"support grid integration theories." » "support grid integration theorems.", "support grid integrationstheorie 2.", "support grid integration theory.", "support agri integration theories.", "support grant integration theories.", "support group integration theories."
"supply canal irrigation schemes." » "supply canal irrigation scheme.", "supply canal irrigation systems.", "supply scale irrigation schemes.", "supply canada irrigation schemes.", "supply annual irrigation schemes.", "supply china irrigation schemes."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("support grid integration theories.") or ("supply canal irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support grid integration theories.") OR ("supply canal irrigation schemes.")).
• Removing quotes may allow a broader search: (( support grid integration theories. ) or ( supply canal irrigation schemes. )).
• Adding a wildcard symbol may retrieve word variants: (("support grid integration theories.") or ("supply canal irrigation schemes."))*.