Perhaps you should try some spelling variations:
"support urban integration theories." » "support urban integration theory.", "support urban integration through.", "support urban integration efforts.", "support global integration theories.", "support trade integration theories.", "support urban migration theories.", "support carbon integration theories.", "support grant integration theories.", "report urban integration theories."
"support european integration theories." » "support european integration theory.", "support european integration through.", "support european integration efforts.", "support europe integration theories."

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

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