Perhaps you should try some spelling variations:
trade interaction » trade integration, face interaction, time interaction
interaction layer » interaction fiber, interaction inter, interaction chapter
3.2 communication » 3 communication, 2.3 communication, de communication
technology trade » technology trends, technology transfer, technology transfers
developpement en » developpement et, developpement des, developpement de
a developpement » au developpement, de developpement, le developpement
layer price » lower price, water price
price 3.2 » prices 3.2, price 2.2, rice 3.2
costs a » costs _, costs 4

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

• Adding a wildcard symbol may retrieve word variants: technology trade interaction layer price 3.2 communication costs a developpement en afrique.*.