Perhaps you should try some spelling variations:
"support grant integration theories." » "support grant integration theorems.", "support grant integrationstheorie 2.", "support grant integration theory.", "support migrant integration theories.", "support migrants integration theories.", "support statt integration theories."
"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.

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