Perhaps you should try some spelling variations:
policy regulation » policy formulation, utility regulation, quality regulation
4.3 communication » 2.3 communication, 4.1 communication, 4 communication
developing en » developing e, developing eq, developing egg
regulation a » regulation _
a developing » a development
case 4.3 » case 4.1, case 4.2, case 2.3
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technology policy regulation a case 4.3 communication costs a developing en afrique.*.