Perhaps you should try some spelling variations:
separation using » operation using, separation among, separation und
developpement de » developpement des, developpement durable
l developpement » le developpement, de developpement, et developpement
der separation » order separation, air separation, ree separation
ideologie der » ideologie und, typologie der
de afrique » de l'afrique, en afrique, l afrique
using age » using ace, using ae, using image
age risk » agent risk, wages risk, rate risk
a l » a la

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

• Adding a wildcard symbol may retrieve word variants: ideologie der separation using age risk communication a l developpement de afrique.*.