Perhaps you should try some spelling variations:
"support tool integration theories." » "support tool integration theorems.", "support tool integrationstheorie 2.", "support tool integration series.", "support global integration theories.", "support 3 integration theories.", "support national integration theories.", "support tools integration theories."
"support social integration theory." » "support global integration theory.", "support financial integration theory.", "support regional integration theory.", "support social integration through.", "support social information theory.", "support social innovation theory.", "supporting social integration theory.", "supply social integration theory."

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

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