Perhaps you should try some spelling variations:
"support group integration theories." » "support group integration theorems.", "support group integrationstheorie 2.", "support group integration theory.", "support group interaction theories.", "support group interactions theories.", "support erp integration theories.", "support grant integration theories."
"export taxes integration series." » "export taxes integration services.", "export taxes interaction series.", "export taxes integration server.", "export spaces integration series.", "export values integration series.", "export res integration series."

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 theories.") or ("export taxes integration series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support group integration theories.") OR ("export taxes integration series.")).
• Removing quotes may allow a broader search: (( support group integration theories. ) or ( export taxes integration series. )).
• Adding a wildcard symbol may retrieve word variants: (("support group integration theories.") or ("export taxes integration series."))*.