Perhaps you should try some spelling variations:
integration soziale » integration social
interaction series » interactions series, interaction studies, interaction terms
test integration » text integration, test cointegration, et integration
supply test » supply west, supply cost, supply 21st
supply 4 » supply _, supply 3
supply a » supply _

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply test integration soziale. ) or ( ((supply 4) or (supply a)) interaction series. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply test integration soziale. ) OR ( ((supply 4) OR (supply a)) interaction series. )).
• Adding a wildcard symbol may retrieve word variants: (( supply test integration soziale. ) or ( ((supply 4) or (supply a)) interaction series. ))*.