Perhaps you should try some spelling variations:
interaction series » interactions series, interaction studies, interaction terms
trade interaction » trade integration, face interaction, time interaction
case internet » based internet, cable internet, das internet
supply case » supply cost, supply chain, supply curve
service. » services.

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

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