Perhaps you should try some spelling variations:
intervention studies » intervention strategies, international studies
case intervention » care intervention, cash intervention, care interventions
supply case » supply cost, supply chain, supply curve
supply over » supply order, supply poverty, supply donor
internet » internal
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 case intervention studies. ) or ( supply over internet service. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply case intervention studies. ) OR ( supply over internet service. )).
• Adding a wildcard symbol may retrieve word variants: (( supply case intervention studies. ) or ( supply over internet service. ))*.