Perhaps you should try some spelling variations:
"supply eine integrationstheorie 2." » "supply der integrationstheorie 2.", "supply revidierte integrationstheorie 2.", "supply die generationstheorie 2.", "supply eine integrationstheorie fur.", "supply eine integration theories.", "supply eine interpretationstheorie 2.", "supply lines integrationstheorie 2.", "supply china integrationstheorie 2."
"supply canal irrigation system." » "supply canal irrigation systems.", "supply canal irrigation water.", "supply canal irrigation scheme.", "supply scale irrigation system.", "supply canada irrigation system.", "supply annual irrigation system.", "supply china irrigation system."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("supply canal irrigation system.") or ("supply eine integrationstheorie 2."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply canal irrigation system.") OR ("supply eine integrationstheorie 2.")).
• Removing quotes may allow a broader search: (( supply canal irrigation system. ) or ( supply eine integrationstheorie 2. )).
• Adding a wildcard symbol may retrieve word variants: (("supply canal irrigation system.") or ("supply eine integrationstheorie 2."))*.