Perhaps you should try some spelling variations:
integration model » integration models, integrative model, interaction model
4.1 communication » 4 communication, 2.3 communication, 3.2 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
model date » model data, model kate, model update
date 4.1 » daten 4.1, data 4.1, date 4.2
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 integration model date 4.1 communication costs a developpement en afrique.*.