Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration series
factor integration » facto integration, sector integration, actor interaction
integration theory » integration through, information theory, innovation theory
fare integration » trade integration, die integration
supply factor » supply factors, supply sector
export fare » export share, export base, export fair

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( export fare integration theories. ) or ( supply factor integration theory. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( export fare integration theories. ) OR ( supply factor integration theory. )).
• Adding a wildcard symbol may retrieve word variants: (( export fare integration theories. ) or ( supply factor integration theory. ))*.