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."
"survey land information theory." » "survey fund information theory.", "survey und information theory.", "survey award information theory.", "surveys poland information theory.", "survey uganda information theory.", "survey based information theory."

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 grid integration theories.") OR ("survey land information theory."))~.
• Removing quotes may allow a broader search: (( support grid integration theories. ) or ( survey land information theory. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support grid integration theories.") or ("survey land information theory."))*.