Perhaps you should try some spelling variations:
integration theories » integration theory, integration through, integration efforts
border integration » market integration, fare integration, modal integration
integration south » integration study, integration some, integration through
support border » support worker, support better
export trade » export share, export taxes, export price

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

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