Perhaps you should try some spelling variations:
oral communication » personal communication
developpement et » developpement des, developpement de, development east
typologien der » typologie der, typologie des, apologien der
der variation » de variation, does variation, die variation
et afrique » en afrique, l afrique
from oral » from moral, from rural, from oil
a set » _ set
a et » a net, a bet, 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: "typologien der variation _ from oral communication ((a et) OR (a set)) developpement et afrique.~".
• Adding a wildcard symbol may retrieve word variants: typologien der variation _ from oral communication ((a et) OR (a set)) developpement et afrique.*.