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