Perhaps you should try some spelling variations:
integration theories » integration theory, integration through, integration efforts
inflation theory » information theory, innovation theory, integration theory
eu integration » _ integration, deep integration, data integration
export price » export prices, import prices
support eu » support key, support _, support a

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

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