Perhaps you should try some spelling variations:
class interactions » class interaction, les interactions, plant interactions
2.7 communication » 2.3 communication, 3.2 communication, 2 communication
technology class » technology glass, technology case, technology cross
developpement il » developpement de, developpement et, developpement du
a developpement » au developpement, de developpement, le developpement
interactions a » interactions _, interactions 4, interactions among
problems 2.7 » problems 2.2, problems 2.4, problems 2.3
a problems » a problem, 2 problems, 3 problems
il afrique » l afrique, en afrique
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 class interactions a problems 2.7 communication costs a developpement il afrique.*.