Perhaps you should try some spelling variations:
oral communication » personal communication
developpement du » developpement de, developpement des, developpement et
variation 4 » variations 4, variation _, variation 6
firms oral » firms rural, firms deal, firms global
du afrique » en afrique, l afrique, de l'afrique
4 firms » 4.1 firms, 4.5 firms, 4.6 firms
pt 3 » pt 1

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

• If you are trying to use Boolean operators, they must be ALL CAPS: typology _ variation 4 firms oral communication ((pt 3) OR (pt 2)) developpement du afrique.~.
• Adding a wildcard symbol may retrieve word variants: typology _ variation 4 firms oral communication ((pt 3) or (pt 2)) developpement du afrique.*.