Perhaps you should try some spelling variations:
integration theories » integration theorems, integrationstheorie 2, integration theory
internet services » internet service
die integration » trade integration
13 internet » 1.3 internet, 1 internet, 11 internet
supply die » supply driven
supply 13 » supply 1.3, supply 3, supply 1

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: (( supply 13 internet services. ) OR ( supply die integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply 13 internet services. ) or ( supply die integration theories. ))*.