Perhaps you should try some spelling variations:
adoption introduction » adaptation introduction, action introduction, edition introduction
data communication » data communications
introduction why » introduction what
open development » clean development, driven development, human development
communication 3 » communication _, communication a
why eo » why ceo, why eu
3 open » 2 open

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

• Adding a wildcard symbol may retrieve word variants: technology adoption introduction why eo data communication 3 open development _ afrique.*.