Perhaps you should try some spelling variations:
communications costs » communication costs, communications _
3.1 communications » 3.1 communication, 4.1 communication, 1.1 communication
technology choice » technology change
choice inflation » choice information, price inflation
developpement du » developpement de, developpement des, developpement et
4 developpement » de developpement, le developpement, et developpement
rate trade » trade trade, water trade, state trade
du afrique » en afrique, l afrique, de l'afrique
trade 3.1 » trade 3.2, trade 4.1, trade 2.1
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 choice inflation rate trade 3.1 communications costs 4 developpement du afrique.*.