Perhaps you should try some spelling variations:
integration theories » integration theory, integration through, integration efforts
integration schemes » irrigation schemes, integration some
grant integration » migrant integration, grid integration, urban integration
support trade » export trade, import trade, support price

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 trade integration schemes. ) OR ( support grant integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (( support trade integration schemes. ) or ( support grant integration theories. ))*.