Perhaps you should try some spelling variations:
wave communications » face communications, data communications, faso communications
developpement de » developpement des, developpement durable
der variation » de variation, does variation, die variation
typology der » typologie der, typologien der, typologie des
variation 6 » variation _, variations _, variation des
costs wave » costs saved, costs water, costs case
6 costs » 3 costs, 4 costs, 6 cost
a net » a new, _ net, a neo
a et » a set, 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: "typology der variation 6 costs wave communications ((a et) OR (a net)) developpement de l'afrique.~".
• Adding a wildcard symbol may retrieve word variants: typology der variation 6 costs wave communications ((a et) OR (a net)) developpement de l'afrique.*.