Perhaps you should try some spelling variations:
integration theory » integration through, information theory, innovation theory
internet services » internet service
data integration » data integrity
das internet » _ internet, im internet
import data » import duty
supply das » supply gas, supply case, supply data

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply das internet services. ) or ( import data integration theory. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply das internet services. ) OR ( import data integration theory. ))*.