Perhaps you should try some spelling variations:
radio communications » radio communication, data communications
communications cost » communications costs, communications cross, communication costs
sensors developed » less developed
risk information » bank information, tourism information, tourist information
information part » information pt, information portal, information portals
cost sensors » iot sensors, soft sensors, gas sensors
iv radio » im radio, _ radio, a radio
part iv » part i, part ii, part iii

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

• Adding a wildcard symbol may retrieve word variants: technology risk information part iv radio communications cost sensors developed _ afrique.*.