Perhaps you should try some spelling variations:
"supply cost integration theories." » "supply cost integration theorems.", "supply cost integrationstheorie 2.", "supply cost integration theory.", "supply post integration theories.", "supply test integration theories.", "supply about integration theories.", "supply costs integration theories."
"supply low irrigation schemes." » "supply low irrigation scheme.", "supply low irrigation systems.", "supply led irrigation schemes.", "supply flood irrigation schemes.", "supply local irrigation schemes.", "supply law irrigation schemes.", "supply crowd irrigation schemes.", "supply block 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: (("supply cost integration theories.") OR ("supply low irrigation schemes."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"supply cost integration theories.\") OR (\"supply low irrigation schemes.\"))*".
• Removing quotes may allow a broader search: (( supply cost integration theories. ) OR ( supply low irrigation schemes. ))*.