Perhaps you should try some spelling variations:
"support grant integration theorems." » "support grant integration theories.", "support grant integration theory.", "support grant integrationstheorie 2.", "support migrant integration theorems.", "support migrants integration theorems.", "support statt integration theorems."
"supply spate irrigation scheme." » "supply spate irrigation systems.", "supply scale irrigation scheme.", "supply water irrigation scheme.", "supply surge irrigation scheme.", "supply system irrigation scheme.", "supply side irrigation scheme."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("support grant integration theorems.") OR ("supply spate irrigation scheme."))~.
• Removing quotes may allow a broader search: (( support grant integration theorems. ) or ( supply spate irrigation scheme. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support grant integration theorems.") or ("supply spate irrigation scheme."))*.