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."
"support grid integration schemes." » "support grid integration schengen.", "support grid irrigation schemes.", "support grid integration regimes.", "support agri integration schemes.", "support grant integration schemes.", "support group integration schemes."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("support grid integration theories.") OR ("support grid integration schemes."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"support grid integration theories.\") OR (\"support grid integration schemes.\"))*".
• Removing quotes may allow a broader search: (( support grid integration theories. ) OR ( support grid integration schemes. ))*.