Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
interaction social » interaction sociale, interactions social, integration social
group interaction » group interactions, through interaction, group introduction
support group » support grant
supply trade » supply case

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