Perhaps you should try some spelling variations:
communication barriers » communication series, communication disorders
2.3 communication » 3.2 communication, de communication, 4 communication
information from » information flow, information flows
du developpement » de developpement, le developpement, et developpement
developpement l » developpement il, developpement la, developpement de
barriers du » barriers d, barriers _, barriers a
l afrique » en afrique
from pre » from peru
pre 2.3 » re 2.3, care 2.3, core 2.3

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

• Adding a wildcard symbol may retrieve word variants: technology _ information from pre 2.3 communication barriers du developpement l afrique.*.