Perhaps you should try some spelling variations:
technology introduction » technology innovation
leur developpement » le developpement, deux developpements, de developpement
3.2 communication » 3 communication, 2.3 communication, de communication
developpement de » developpement des, developpement durable
wage trade » wages trade, wage rate, jade trade
costs leur » costs clear
de afrique » de l'afrique, en afrique, l afrique
trade 3.2 » trade 2.2, trade 2, trade 4.1

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

• Adding a wildcard symbol may retrieve word variants: technology introduction _ wage trade 3.2 communication costs leur developpement de afrique.*.