Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
process integration » process innovation, process information
integration wage » integration wege, integration wie, integration work
1 communications » 10 communications, 14 communications, 1 communication
developpement du » developpement de, developpement des, developpement et
ecology process » technology process, economic process, recovery process
4 developpement » de developpement, le developpement, et developpement
wage trade » wages trade, wage rate, jade trade
du afrique » en afrique, l afrique, de l'afrique
trade 1 » trade _, trade a, trade 4
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: ecology process integration wage trade 1 communications costs 4 developpement du afrique.*.