Perhaps you should try some spelling variations:
communication barriers » communication series, communication disorders
3.2 communication » 3 communication, 2.3 communication, de communication
law developpement » le developpement, au developpement, leur developpement
formation across » information across, variation across, variations across
developpement de » developpement des, developpement durable
across signe » across nine, across science, across age
barriers law » carriers law, barriers a, barriers _
de afrique » de l'afrique, en afrique, l afrique
signe 3.2 » scene 3.2, ligne 3.1, sne 3.2

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

• Adding a wildcard symbol may retrieve word variants: technology _ formation across signe 3.2 communication barriers law developpement de afrique.*.