Perhaps you should try some spelling variations:
"support through integration efforts." » "support through innovation efforts.", "support through information efforts.", "support through international efforts.", "support through conservation efforts."
"support tax integration theory." » "support tax integration through.", "support tax information theory.", "support tax integration report.", "support can integration theory.", "support tax interaction theory.", "support trade integration theory.", "support a integration theory.", "support staff integration theory.", "support state 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 through integration efforts.") or ("support tax integration theory."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support through integration efforts.") OR ("support tax integration theory.")).
• Removing quotes may allow a broader search: (( support through integration efforts. ) or ( support tax integration theory. )).
• Adding a wildcard symbol may retrieve word variants: (("support through integration efforts.") or ("support tax integration theory."))*.