Perhaps you should try some spelling variations:
developpement en » developpement et, developpement des, developpement de
separation using » operation using, separation among, separation und
l developpement » le developpement, de developpement, et developpement
air separation » a separation, after separation, first separation
ideologie air » ideologie der, ideologie a, ideologie als
less risk » less risky, lens risk, loss 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 air separation using less risk communication a l developpement en afrique.*.