Perhaps you should try some spelling variations:
integration theories » integration theory, integration through, integration efforts
integration volume » integration policy
group integration » grid integration, run integration, through integration
side integration » trade integration, asian integration, grid integration
support group » support from, support grant

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( support group integration theories. ) OR ( supply side integration volume. ))~.
• Adding a wildcard symbol may retrieve word variants: (( support group integration theories. ) or ( supply side integration volume. ))*.