Perhaps you should try some spelling variations:
transfer regulation » transport regulation, transfer reduction, transfer regulatory
regulation carbon » regulation cameroon, vegetation carbon, regulation can
6.2 communication » 3.2 communication, 2.3 communication, 2.7 communication
carbon crime » carbon crisis, carbon cycle, carbon city
4 developing » 3 developing
developing a » developing _
crime 6.2 » crime 5.4, crime 1.5, crime 4.6
a afrique » l afrique, en afrique
costs 4 » costs _, costs a, costs 4.2

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

• Adding a wildcard symbol may retrieve word variants: technology transfer regulation carbon crime 6.2 communication costs 4 developing a afrique.*.