Perhaps you should try some spelling variations:
rural communications » oral communication, rural telecommunications, cultural communications
developpement du » developpement de, developpement des, developpement et
2 variation » 2 variations
typology 2 » typology _, typology 6, typology a
du afrique » en afrique, l afrique, de l'afrique
a bet » a best, a bent, a beta
a et » a set, a net, a jet

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "typology 2 variation _ a rural communications ((a et) OR (a bet)) developpement du afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology 2 variation _ a rural communications ((a et) OR (a bet)) developpement du afrique.*.